Anat II Test 2 Flashcards
What bone separates the two orbits?
Ethmoid Bone
What forms the medial walls of each orbit?
Sides of Ethmoid Bone
What angle are the lateral walls at?
90
Right Angle
The Axes of the orbits diverge at what degree?
45
What axes are for sight?
Optical Axes
Are the Optical Axes parallel or perpendicular?
Parallel
What are the functions of the orbits?
Contain- eyeball and accessory organs
Guard- protect eyeball
What are the 6 accessory structures of the orbit?
- Eyelid
- Extraocular M
- Nerves and Vessels
- Orbital Fascia
- Mucous Membrane
- Orbit Fat
Number or walls, bases and apex of Orbit?
4 Walls
1 Base
1 Apex
What is the base of the Orbit?
Orbit Margin is the outline of the base
The margin is strong because of its thickness
What is the Superior Wall of the Orbit?
Formed by the Orbital Part of the Frontal Bone and Lesser Wing of Sphenoid Bone
Separates the orbit from the anterior cranial fossa
What is the Fossa for the Lacrimal gland? Where is it located in relation to the Superior wall of the orbit?
It is a shallow impression
Located anterolaterally to the Superior Wall of the Orbit
What is the Medial Wall of the Orbit?
Formed by the Frontal, Lacrimal, Ethmoid, and Sphenoid bones (from front to back)
What structures are on or next to the Medial Wall?
Ethmoid Sinuses are next to this wall
The Lacrimal Groove, Fossa and sac are on this wall
What is the Inferior Wall of the Orbit?
Formed by the Maxilla, Zygomatic and Palatine Bones
What divides the Inferior Wall from the Lateral Wall of the Orbit?
Inferior Orbital Fissure
What is the Lateral Wall of the Orbit?
Formed by the Frontal Process of the Zygomatic Bone and Greater WIng of the Sphenoid Bone
This wall is easily injured
What is the Apex of the Orbit?
At the Optic Canal on the lesser wing of the Sphenoid Bone
What is the function of the eyelid?
Protect eyeballs from irritating strong light and dust with help from the lacrimal fluid
What is the function of Extraocular Muscle?
Move eyeballs and eyelids
What is the function of Nerves and Vessels of the orbit?
To supply nutrition
What is the function of the Orbital Fascia?
Protect eyeballs and muscles
What is the funciton of the Mucous Membrane?
Lubricate the eyeballs
What is the function of Orbit Fat?
Matrix for eyeballs
What covers the eyelids on the inside?
Palpebral Conjunctiva
Superior and Inferior parts
What is the Bulbar Conjunctiva?
It covers the surface of the eyeball
Continuous with the palpebral conjunctiva
What is the Palpebral Fissure?
Opening of the eye
What is the superior and inferior fornics?
Space formed when pulling eyelid up or down
If eyes are closed this space is called CONJUNCTIVA SAC
(page 31 no set definition)
What are the soft bones of the eye?
Superior and Inferior Tarsi
What is the Tarsal Gland? Where is it?
Provides the lipid secretion to eye for lubrication
Located in the Tarsi
What kind of glands are located at the root of the eye lashes?
Sebaceous Glands
What is a Chalazia?
When the sebaceous glands are clogged due to infection and become swollen
(Stye)
The conjunction of the superior and inferior eyelids is called?
Medial and Lateral Palpebral Commissures
AKA Canthi
What ligament connects the Tarsi to the bone of the orbit?
Medial Palpebral Ligament
Lateral Palpebral Ligament (not as strong b/c other tissues help)
What aids the Lateral Palpebral Ligament in holding the eye/eyelid in orbit?
Orbital Septum
What 5 things does the Lacrimal Apparatus Include?
- Lacrimal Gland
- Lacrimal Duct
- Lacrimal Canaliculi
- Lacrimal Sac
- Nasolacrimal Duct
What is the function of the Lacrimal Gland?
Secretes Lacrimal Fluid
Fluid is bacteriocidal and nutrient/oxygen rich
What nerve supports the Lacrimal Gland?
Lacrimal Nerve- Ophthalmic N (V1)
What kind of Nerve or Nerves are in the Lacrimal Nerve?
Parasympathetic and Sympathetic
In the Lacrimal Nerve, where do the Presynaptic Parasympathetic Fibers originate?
Facial Nerve
What Ganglion do the Presynaptic Parasympathetic Fibers of the Lacrimal Nerve synapse in?
Pterygopalatine Ganglion
What kind of Fibers are sent out of the Pterygopalatine Ganglion that make the Lacrimal Gland secrete less fluid?
Postsynaptic Parasympathetic Fibers
What is the Path of the Sympathetic fiber that makes the Lacrimal Gland secrete more fluid?
Presynaptic Sympathetic Fibers go to the Superior Cervical Ganglion then to the Pterygopalatine Ganglion and into the Zygomatic Nerve
What nerve do the Sympathetic Fibers of the Lacrimal Gland travel in?
Zygomatic Nerve
What are Lacrimal Ducts?
Several small ducts from the Lacrimal Gland
What part of the Lacrimal Apparatus collects tears from the Lacrimal Lake?
Lacrimal Punctum
Lacrimal Papilla
(tear holes on eyelids)
What transports the tears from the Lacrimal Lake to the Lacrimal Sac?
Lacrimal Canaliculi
What does the Nasolacrimal Duct do?
Leads the tears to the nose so they can be swallowed
What occupies most of the anterior part of the orbit?
The eyeball
What part of the eye is filled with all supporting material for the eyeball?
Posterior part of the Orbit
What is the Loose CT (connective tissue) that surrounds the eyeball?
Fascial Sheath (outermost layer around eyeball)
What is the posterior part of the Fascial Sheath called?
Bulbar Fascia
AKA Tenon’s Fascia
What does the Bulbar or Tenon’s Fascia do?
Forms the socket for the eyeball
What are the three layers of the eyeball?
- Outer- Fibrous Layer
- Middle- Vascular Layer
- Inner
What 2 parts make up the Outer Fibrous Layer of the Eyeball?
Sclera and Cornea
What is the name of the Middle Vascular Layer of the Eyeball?
Uvea or Uveal Tract
What makes up the Inner Layer of the Eyeball?
Retina
What is the Sclera?
Tough Fibrous Layer
White and Opaque
AKA the white of the eye
What is the Cornea?
Transparent
Occupies 1/6 of the eyeball
Why is the Sclera white and the Cornea Clear?
Their fibers are arranged differently
What are the 3 parts of the Uvea?
Choroid
Ciliary Body
Iris
What are the two parts of the Retina?
Optic Part- Visual Part
Non-Visual Part
What color is the Choroid? What layer of the eyeball is it in?
Dark Reddish Brown Membrane
Uvea or Uveal Tract
Where does the Choroid get it’s color from?
Pigmented cells
Rich in blood vessels
What is the large blood vessel layer of the Choroid called?
Vascular Lamina
What layer of the Choroid is the Vascular Lamina?
Outer layer
How many layers does the Choroid have?
3
What layer of the Choroid is the middle layer?
Capillary Lamina
What does the Capillary Lamina do?
Contacts the Retina
Provides Nutrition directly to the Retina
What is the innermost layer of the Choroid?
Light- Sensitive Layer of the Retina
What does the Light Sensitive Layer of the Retina do?
Accepts light
Does not have any blood vessels
What does the Choroid stick to very well?
Retina
Easily stripped from the Sclera
What is the Ciliary Body?
Smooth Muscle and Blood Vessels
Located Anterior to the Choroid
What layer of the eyeballs is the Ciliary Body in?
Middle, Vascular Layer
Uvea
What parts of the Ciliary Body provide attachment for the lens?
Ciliary Process
Zonular Fibers
What happens to the lens when changing from long distance vision to short distance vision?
Lens becomes thicker
B/c Ciliary body m. contracts
What are the folds behind the Ciliary Body that secrete Aqueous Humor?
Ciliary Processes
What is Aqueous Humor?
Liquid Fills Anterior and Posterior Chamber Balances Pressure for the eye Provides Nutrition to the eye Has no blood vessels
Where is the Anterior Chamber?
Space btw Cornea and Iris/Pupil
Where is the Posterior Chamber?
Space btw the Iris/Pupil and the Lens/Ciliary Body
What is the Iris?
Contractile Diaphragm with an opening in the center (Pupil)
What is the Pupil used for?
Transmitting light
What are the 2 involuntary smooth muscles located in the Ciliary Body?
- Sphincter Pupillae
2. Dilator Pupillae
What kind of nerve controls the Sphincter Pupillae?
Parasympathetic Nerve
What kind of nerve controls the Dilator Pupillae?
Sympathetic Nerve
What happens to the pupil when the Sphincter Pupillae contracts?
Pupil becomes small
happens in bright places so the eye isn’t overwhelmed by light
What happens to the pupil when the Dilator Pupillae contracts?
The pupil becomes larger
Happens in the dark so we can take in as much light as possible
Which of the 3 layers of the eyeball is the most important?
Retina
What does the Retina do?
Receives images and sends them to the brain
How many layers is the Retina divided into in Ophthalmology?
10
What part of the Retina is light sensitive?
Optic Part
What are the 2 layers of the Optic Part of the Retina?
- Neural Layer
2. Pigment Layer
Which layer of the Optic part is light receptive?
Neural Layer
What is the Pigment Layer of the Optic Part?
Contains a single layer of pigmented cells, so it’s black
Absorbs the extra light
What is the Non-Visual Part of the Retina?
Layer of Pigmented cells
Continuous with the Pigment Layer of the Optic Part of the Retina
Covers the back of the Ciliary Body/ Iris
Does the Non-Visual Part of the Retina accept images? Why or Why not?
No, it cannot because light doesn’t reach it
Where and what is the Ora Serrata?
Located btw Non-Visual Part and Pigmented Layer
Irregular border/line separating the Non-Visual Part from the Optic Part
Where is the Fundus located?
Posterior to the eyeball
What part of the Fundus is round and depressed?
Optic Disc
Optic Papilla
What goes through the Optic Disc/Optic Papilla?
Fibers exit the Retina
Blood Vessels enter the Retina
What is the name of the blind spot of the eye? Why is it blind?
Optic Disc/ Papilla
No photoreceptors
What is lateral to the Optic Disc?
Macula (Lutea)
What part of the eye is an acute place for vision due to many special photoreceptors?
Macula
What is at the center of the Macula?
Fovea Centralis
What is the Fovea Centralis
Most acute vision place
1.5mm in diameter
What is at the center of the Fovea Centralis?
Foveola
What is the Foveola?
Center part of Fovea Centralis
Sharpens Vision
No capillaries
What Artery supplies the Retina?
Central Artery of the Retina
Branch of the Ophthalmic Artery
What 4 structures must lightwaves pass thru to get to the Retina?
- Cornea
- Aqueous Humor
- Lens
- Vitrous Humor
What part of the eye is responsible for light refraction?
Cornea
What is the Cornea innervated by?
CN V1
Ophthalmic Nerve
Where does the Aqueous Humor go to?
Sclera Venous Sinus
AKA Canal of Schlemm
Where is the Canal of Schlemm/ Sclera Venous Sinus Located?
Iridoconeal Angle
It’s a circular Vessel
What is a Glaucoma caused by?
A blockage in the Canal of Schlemm
Old Humor cannot leave and produces a high pressure
Where is the Lens located?
Posterior to the Pupil
What makes up the Lens?
High Elastic outer layer
Capsule of the lens is attached via Zonular Fibers (from the Ciliary Body)
Changing the shape of the Lens changes what?
Refraction of light
What has the power to change the shape of the Lens?
Ciliary Muscle
What is Vitrous Humor?
Jelly like Material
Where is the Vitrous Humor Located?
Posterior to the Lens
What does the Vitrous Humor do?
Transmits light and supports the eyeball
Especially, the Retina and Lens
What are the 7 muscles of the orbit?
- Levator Palpebra Superioris m.
- Superior Rectus m.
- Medial Rectus m.
- Lateral Rectus m.
- Inferior Rectus m.
- Superior Oblique m.
- Inferior Oblique m.
What does rectus mean?
Straight
What is the Levator Palpebral Superioris used for?
Elevate the Superior Eyelid
What are the Rectus and Oblique m. used for?
Move eyeballs
What does Opposition mean?
The opposing m. on the same eye should always cooperate with the action of the opposite side in order to maintain balance
How many layers does the Levator Palpebral Superioris m. have?
2
Where do the 2 layers of the Levator Palpebral Superioris m. go?
- Skin of the eyelid
2. Superior Tarsal (Muller’s Muscle)
What kind of nerves supply Muller’s Muscle?
Sympathetic Fibers
What nerve supplies the layer of the Levator Palpebral Superioris that goes to the skin?
Oculomotor Nerve
What is the Origin of the 4 Rectus m.?
Common Tendinous Ring
What does the Common Tendinous Ring do?
Attaches the Optic Canal and part of the Superior Orbital Fissure
Many Nerves and Vessels penetrate to go into Orbit
In what way does the Superior Rectus m. move the pupils?
Superior
Medial
What m. balances the Medial movement of the Superior Rectus m.?
Superior Oblique m.
What m. helps the Superior Rectus m. move the pupil superiorly?
Inferior Oblique m.
What is Intorsion and Extorsion?
Movements around the Anteroposterior Axis
Intorison means what?
Medially
So, Medial Rotation
Extorsion means what?
Laterally
So, Lateral Rotation
Rotation around the Transverse Axis moves pupil how?
Superiorly- Elevation
or
Inferiorly- Depression
Rotation around the Vertical Axis moves the pupil how?
Medially- Adduction
or
Laterally- Abduction
Levator Palpebral Superioris m. Main Action
Elevates superior eyelid
M/D p. 900
Superior Oblique m. Main Action
Abducts
Depresses
Medially Rotates
(M/D p. 900)
Inferior Oblique m. Main Action
Abducts
Elevates
Laterally Rotates
(M/D p. 900)
Superior Rectus m. Main Action
Elevates
Adducts
Medially Rotates
(M/D p. 900)
Inferior Rectus m. Main Action
Depresses
Adducts
Laterally Rotates
(M/D p. 900)
Medial Rectus m. Main Action
Adducts
M/D p. 900
Lateral Rectus m. Main Action
Adducts
M/D p. 900
What is a Yoke Muscle?
Muscles that work together to make both eyes view one object
R. Lateral Rectus and L. Medial Rectus
What are the 5 Nerves of the Orbit?
- CN II
- CN III
- CN IV
- CN V1
- CN VI
CN II is what nerve?
Optic
CN III is what nerve?
Oculomotor
CN IV is what nerve?
Trochlear
CN V is what nerve?
Trigeminal
CN V1 is what nerve?
Ophthalmic
CN VI is what nerve?
Abducent
What two holes do the nerves of the orbit travel through from the cranial cavity to the orbit?
Superior Orbital Fissure
Optic Canal
Which of the Orbital Nerves travels in the Optic Canal?
CN II- The Optic Nerve
Which CN support the extraocular m. of the orbit?
CN III
CN IV
CN VI
LR6SO4AO3
Lateral Rectus- Abducent
Superior Oblique- Trochlear
All Others- Oculomotor
What does LR6SO4AO3 mean?
LR6 Lateral Rectus- Abducent SO4 Superior Oblique- Trochlear AO3 All Others- Oculomotor
What orbital nerves travel through the Superior Orbital Fissure to supply the Lacrimal Gland and Eyelids?
Ophthalmic (CN V1)- Frontal, Nasociliary and Lacrimal
Ciliary Ganglion belongs to what nerve?
Oculomotor (CN III)
Ciliary Ganglion is associated with what nerve?
Trigeminal (CN IV)
What makes up the Ciliary Ganglion?
Small group of postsynaptic parasympathetic nerve cell bodies
Where is the Ciliary Ganglion located?
Btw Optic Nerve and Lateral Rectus
What is the most important function of the Ciliary Ganglion?
Parasympathetic neurons to change from pre to post
What 3 nerves enter the Ciliary Ganglion?
- Sensory Fibers from the Trigeminal (CN V1)
- Presynaptic Parasympathetic fibers from the Oculomotor (CN III)
- Postsynaptic Sympathetic Fibers from the Internal Carotid Plexus
How do the Sensory fibers of the Trigeminal Nerve get to the Ciliary Ganglion?
Communicating branch of the Nasociliary Nerve
AKA Sensory Root
AKA Nasociliary Root of Ciliary Ganglion
How do the Presynaptic Parasympathetic Fibers get to the Ciliary Ganglion?
Oculomotor Root of Ciliary Ganglion
AKA Parasympathetic Root
How do the Postsynaptic Sympathetic FIbers get to the Ciliary Ganglion?
Sympathetic Root of the Ciliary Ganglion
come from a sympathetic ganglion in neck
What are the 4 nerves sent out of the Ciliary Ganglion?
- Short Ciliary Nerves
- Parasympathetic Fibers
- Sympathetic Fibers
- Sensory Fibers
Where do the Short Ciliary Nerves go to?
Iris
Ciliary Body
Cornea
Where do the Parasympathetic Fibers that exit the Ciliary Ganglion go to?
Spincter Pupillae
Ciliary Muscle
Makes pupil small
Makes Lens thick
Where do the Sympathetic FIbers that exit the Ciliary Body go to?
Dilator Pupillae
Makes pupil large
Where do the Sensory Fibers that exit the Ciliary Ganglion go to?
Cornea to receive sensation
Where does Horner Syndrome come from?
Injury of the Cervical Sympathetic Trunk
What happens in Horner Syndrome?
Ipsilateral (same side) Sympathetic Function lost
No stimulating can be induced
Therefore, nerve died
If nerve is dead then m, organ, tissue will not work agian
What are the 4 Signs of Horner Syndrome?
- Constriction of the pupil (miosis)
- Drooping of the Superior Eyelid (ptosis)
- Redness and Increased Temperature of the skin (visodilation)
- Absence of sweating (anhydrosis)
Miosis means?
Constriction of the Pupil
Why would the pupil become constricted?
Sympathetic nerves stops working (it dilates) so work is finished by parasympatheic n.
Parasympathetic n controls the sphincter pupillae (makes pupil small).
Therefore, pupil becomes constricted
Why would the Superior Eyelid Droop?
Superior Tarsal m. (Mueller’s Muscle) is paralyzed
This is b/c the sympathetic n that supplies the m. doesn’t work
m. stops working, eyelid goes down
Ptosis means?
Drooping of the Superior Eyelid
Blood supply of the orbit is mainly from what artery?
Ophthalmic Artery- from Internal Carotid Artery
and
Infraorbital Artery- from External Carotid Artery
How many branches does the Ophthalmic a. have?
He said 11 in class (don’t worry about Dorsal Nasal)
Notes have 12
What are the 12 Branches of the Ophthalmic?
- Central a. of the Retina
- Short Posterior Ciliary
- Long Posterior Ciliary
- Anterior Ciliary
- Muscular Branches
- Lacrimal
- Supraorbital
- Supratrochlear
- Dorsal Nasal
- Anterior Ethmoid*
- Posterior Ethmoid*
- Infraorbital
Central a. of the Retina
From Ophthalmic
Runs in Optic n until the Optic Disc
Divides into 4 ending branches
Provides nutrition to the internal layer of the Retina
Short Posterior Ciliary Arteries
6
Branch in Choroid
Send nutrition to external layer of Retina through extracellular fluids
(Notes p. 41 top)
Long Posterior Ciliary Arteries
2
Supply Ciliary Body + Iris
Anterior Ciliary Arteries
Sent out by Muscular Branches (anastomosis with Long Posterior Ciliary a.)
What are the 2 veins of the Orbit?
- Superior Ophthalmic Vein
2. Inferior Ophthalmic Vein
Where do the 2 Orbital veins pass through to enter the cranial cavity?
Superior Orbital Fissure
What do the 2 Orbital veins connect with inside the skull?
Cavernous Sinus
What do the 2 Orbital veins communicate with?
Pterygoid Venous Plexus
Facial Vein
Scleral Venous Sinus (AKA Canal of Schlemm)
Very special to eye
Circular vein around the anterior chamber
*Through this sinus the Aqueous Humor returns to Blood Circulation
What is the Superior Border of the Parotid Region?
Zygomatic Arch
What is the Inferior Border of the Parotid Region?
Angle and Inferior border of Mandible
What is the Anterior Border of the Parotid Region?
Anterior border of Masseter m.
What is the Posterior Border of the Parotid Region?
External Ear
Anterior Border of the SCM m.
What is the Medial Border of the Parotid Region?
Ramus of the Mandible
Which gland is the largest of the 3 Salivary glands?
Parotid Gland
What encloses the Parotid gland within a tough facial capsule?
Parotid Fascia
Where does the Parotid Fascia come from?
Investing layer of deep cervical Fascia
What shape is the Parotid Gland?
Triangular
What is the Parotid Gland wedged between?
Ramus of the Mandible
Mastoid Process
What is the Parotid Gland divided into? What’s inside?
Lobes
Fat is inside
What exits the Anterior part of the Parotid Gland?
Parotid Duct
What is the route of the Parotid Duct?
From Anterior part of gland
goes forward to anterior border of the masseter
enters oral cavity
Where is the opening of the Parotid Duct?
Opposite to the 2nd Maxillary Molar Tooth
What are the 3 structures imbedded in the Parotid Gland?
- Parotid Plexus of the Facial Nerve (CN VII)
- Retromandibular Vein
- External Carotid Artery
What 3 nerves innervate the Parotid Gland?
- Greater Auricular Nerve
- Auriculotemporal Nerve
- Sympathetic Nerve
Where does the Great Auricular Nerve come from?
C2/C3 Cervical Plexus from Spinal nerve
Where does the Auriculotemporal Nerve in the Parotid Gland come from?
Nerve is sent out by Otic Ganglion as a Postsynaptic parasympathetic fiber
Presynaptic fibers from Glossopharyngeal nerve (CN IX) send fibers to the Otic Ganglion
Where do the Sympathetic Nerves of the Parotid Gland come from?
External Carotid Nerve Plexus
What is the Superior Boundary of the Temporal Region?
Temporal Lines
What is the Inferior Boundary of the Temporal Region?
Infratemporal Crest
What is the Anterior Boundary of the Temporal Region?
Frontal and Zygomatic Bones
What is the Posterior Boundary of the Temporal Region?
Temporal Lines
What is the Floor of the Temporal Region?
Bones: Frontal Parietal Temporal Sphenoid
Pterion is here*
In what Boundary of the Temporal Region is the Pterion found?
Floor
What is the Roof of the Temporal Region?
Temporal Fascia (covers Temporal m)
What is the Temporal Fascia?
Covers Temporal Muscle
Tough
Attaches superior temporal line and zygomatic arch
Has 2 layers to attach to medial and lateral side of the arch
Where is the infratemporal fossa located? Is it a regular or irregular space?
Irregular Space
Under the zygomatic arch
Deep to the ramus of the mandible
Posterior to Maxilla
What’s the Superior Border of the Infratemporal Region?
Inferior Surface of the Greater Wing of the Sphenoid Bone
What is the Inferior Border of the Infratemporal Fossa?
Attachment place of the Medial Pterygoid Muscle
What is the Anterior Border of the Infratemporal Fossa?
Posterior Aspect of the Maxilla
What is the Posterior Border of the Infratemporal Fossa?
Tympanic Plate
Mastoid Process
Styloid Process
What is the Medial Border of the Infratemporal Fossa?
Lateral Plate of the Pterygoid Bone
What is the Lateral Border of the Infratemporal Fossa?
Ramus of the Mandible
What are the Contents of the Temporal Region?
Temporalis Muscle
What are the muscular contents of the Infratemporal Fossa? (3)
- Inferior Part of Temporal Muscle
- Lateral Pterygoid Muscle
- Medial Pterygoid Muscle
What are the artery contents of the Infratemporal Fossa? (1)
Maxillary Artery
What are the venous contents of the Infratemporal Fossa? (1)
Pterygoid Venous Plexus
What is the nerve content of the Infratemporal Fossa? (6)
- Mandibular Nerve
- Inferior Alveolar Nerve
- Buccal Nerve
- Lingual Nerve
- Chorda Tympani Nerve
- Otic Ganglion
Where is the Maxillary Artery from?
Terminal Artery of the External Carotid Artery posterior to neck of mandible
What muscle divides the Maxillary Artery into 3 parts?
Lateral Pterygoid Muscle
2nd part lies on this muscle
How many branches come from the Maxillary Artery?
15
5:4:6 for part 1, 2, and 3
What are the 3 main branches of the Maxillary Artery?
- Masseteric
- Inferior Alveolar
- Middle Meningeal
How does the Masseteric artery travel?
Through the Mandibular Notch
What does the Masseteric Artery Supply?
Temporomandibular Joint
Masseter Muscle
How does the Inferior Alveolar Artery run?
Enters Mandibular Canal through Mandibular Foramen
What does the Inferior Alveolar Artery Supply?
Teeth and Mandibular Bone
How does the Middle Meningeal Artery Run?
Through a loop of the Auriculotemporal nerve
Into Cranial cavity through Foramen Spinosum
What does the Middle Meningeal Artery Supply?
Dural Mater
Facial Nerve
Trigeminal Nerve
What Venous system supplies the Infratemporal Fossa?
Pterygoid Venous Plexus
Where is the Pterygoid Venous Plexus located?
Btw Temporal m and Pterygoid m
What does the Pterygoid Venous Plexus anastomose with?
Facial Vein through the Deep Facial Vein
Cavernous Sinus through Emissary Veins
How does the Mandibular Nerve run?
Through the Foramen ovale and into the infratemporal fossa
What are the 5 branches of the Mandibular Nerve?
- Auriculotemporal
- Inferior Alveolar
- Buccal
- Lingual
- Masseteric
What Nerve of the Infratemporal Fossa comes from the Facial Nerve?
Chorda Tympani Nerve
This nerve encircles the middle meningeal artery, then divides into several branches to supply the skin of the auricle and temporal scalp. It also contains Parasympathetic fibers to the Parotid Gland.
Auriculotemporal Nerve
This nerve goes into the mandibular canal through the mandibular foramen and supplies all mandibular teeth. It also exits the mental foramen to become the mental nerve and supplies the skin of the chin, mucous membrane of the lower lip and vestibular gingiva.
Inferior Alveolar Nerve
This nerve is a sensory nerve to the anterior 2/3 of the tongue, floor of the mouth and the lingual gingiva. It travels before the inferior alveolar nerve
Lingual Nerve
What is the Chorda Tympani a branch of?
Facial Nerve
What does the Chorda Tympani join? Is it sensory or motor?
Joins Lingual Nerve-Sensory for taste
Submandibular ganglion-Motor to supply the Mandible and Sublingual Glands
Where is the Otic Ganglion located?
Infratemporal Fossa
Deep to Mandibular Nerve
Is the Otic Gangion Parasympathetic or Sympathetic? What nerve does it send to the Parotid Gland?
Parasympathetic
Auriculotemporal Nerve
What nerve supplies all muscles of mastication except the buccinators?
Masseteric Nerve
What type of joint is the TMJ?
Synovial Joint
What are the three components of the TMJ?
- Joint Surface
- Joint Capsule
- Joint Cavity
What part of a joint is covered by articular cartilage?
Joint Surface
What part of a joint contains a small amount of lubricating synovial fluid that is secreted by the synovial membrane?
Joint Cavity
What part of a joint consists of a fibrous and synovial capsule?
Joint Capsule
What are the 3 components of the TMJ’s Joint surface?
- Condyle of the Mandible
- Mandibular Fossa
- Articular tubercle of the Temporal bone
What is the special cavity with a cartilage articular disc between the joint surfaces?
Joint Cavity
separated by the disc into two cavities
What is the fibrous layer that attaches to the margins of the articular area on the temporal bone and around the neck of the mandible?
Joint Capsule= loose
What are the two membranes of the joint cavity called? What separates them?
Superior Synovial Membrane
Inferior Synovial Membrane
Articular Disk
What is the intrinsic ligament of the TMJ?
Temporomandibular Ligament
AKA Lateral Ligament
Describe the Temporomandibular Ligament
Part of the Fibrous layer of capusle
Increases strength of lateral part of TMJ
What are the 2 extrinsic ligaments of the TMJ?
- Stylomandibular Ligament
2. Sphenomandibular Ligament
Describe the Stylomandibular Ligament
From fibrous capsule of the parotid gland
Runs from Styloid process to angle of the mandible
Describe the Sphenomandibular Ligament
From Spine of Sphenoid to Lingua of Mandible
Real Ligament
(Spine is under the Sphenoid bone)
What kind of joint is the TMJ?
Hinge joint
AKA Ginglymus Joint
Uniaxial Joint
Can only do Elevation and Depression- because of articular disc
This action opens the mouth
Depression
What occurs during depression and elevation?
Condyles on both sides move on same axis combining the two joints
Condyle and Disc DO NOT slide Anteriorly or Posteriorly
They stay in Mandibular Fossa
This action closes the mouth
Elevation
What action sends the mandible forward?
Protrusion
What do the condyles do during Protrusion?
Both condyles slide forward
Condyle and disc slide against mandibular fossa anteriorly in superior cavity
What actions sends the mandible backward?
Retrusion
What do the condyles do during retrusion?
Condyles of two sides slide backward
Condyle and disc slide against the mandibular fossa posteriorly in superior cavity
What kind of movement is grinding and chewing?
Lateral Movement
In what movement does one condyle stay in the mandibular fossa and one rotate while the other condyle and disc slide in the mandibular fossa?
Lateral Movement
What 4 actions are included in Lateral Movement?
Rotation
Sliding
Grinding
Chewing
Which movement of the TMJ is a “big depression action” in which we open our mouth very wide?
Combination Movement of Hinge and Grinding
What happens to the condyle in Combination Movement of Hinge and Grinding?
Condyle and disc move forward to under the articular tubercle
What happens to the condyle if we dislocate it anteriorly?
Condyle passes anterior to the anterior tubercle
What can cause a dislocation of the jaw?
Yawning
Taking large bite
What is Jaw Locked Open?
Mandible remains wide open and the person cannot close the mouth
What are the 4 muscles of Mastication/TMJ movement?
- Temporal m
- Masseter m
- Lateral Pterygoid m
- Medial Pterygoid m
What three Muscles of Mastication mainly Elevate the Mandible?
Temporal M
Masseter M
Medial Pterygoid M
Which muscle of Mastication mainly Protrudes and Depresses the Mandible?
Lateral Pterygoid M
What are the 4 muscles of Mastication developed from?
Mesoderm of the Embryonic FIRST PHARYNGEAL ARCH (AKA Mandibular Arch)
What nerve innervates all 4 of the muscles of Mastication?
Motor Root of Mandibular Nerve (CN V3)
This nerve innervates the arch from embryonic stage thru adulthood
What other 3 muscles aid in TMJ movement?
- Suprahyoid
- Infrahyoid
- Playtisma
What are the 2 functions of the Oral Region?
- Digestion
2. Speaking
What are the 4 steps of the digestion process in the Oral Cavity?
- Taking in food
- Minced by teeth
- Chemically treated by saliva
- Swallowed
Is swallowing an Automatic or Voluntary Process?
Automatic
Taking in food is voluntary
What is the Superior border of the lips?
Naris
What is the Lateral border of the lips?
Nasolabial Sulcus
What is the Inferior border of the lips?
Mentolabial Sulcus
What are the three layers of the lips?
- Skin
- Orbicularis Oris
- Mucous Membrane
What color is the Transition zone? Why?
Red
Capillaries under thin skin
What is the purpose of the Transition Zone?
Connect skin outside with the mucous membrane inside of the mouth
What is the fold of Mucous Membrane in the Midline of the Upper and Lower Lip called?
Labial Frenulum
What 4 Arteries form the ring around the lips?
- Superior Labial a
- Inferior Labial a
- Infraorbital a
- Mental a
Where are the Superior/Inferior Labial arteries from?
Facial Artery
What nerve supplies the upper lip?
Infraorbital Nerve (Maxillary of Trigeminal)
What nerve supplies the lower lip?
Mental Nerve (Mandibular of Trigeminal)
Where does the Lymph of the Lip region go?
Submental Lymph Nodes
The cheeks are equal to what region outside?
Buccal Region
What is the Anterior Border of the Cheek?
Oral and Mental Region
What is the Superior Border of the Cheek?
Zygomatic Region
What is the Posterior Border of the Cheek?
Parotid Region
What is the Inferior Border of the Cheek?
Border of the Mandible
What other two regions do people associate with the Cheek?
Zygomatic Region
Parotid Region
What are the three layers of the Cheeks?
- Skin
- Muscle
- Mucous Membrane
What 3 things are included in the Middle Layer of the Cheek?
Buccinator M
Buccal Gland
Buccal Fat-Pads
What does the Buccinator Muscle do?
Holds food btw the teeth
What Artery Supplies the Cheek?
Buccal Artery of Maxillary Artery
What Nerve supplies the Cheeks?
Buccal Nerve of Mandibular Nerve
What are the 2 parts of the Oral Cavity?
- Vestibule
2. Oral Cavity Proper
Where is the vestibule of the Oral Cavity Located?
Outside of the teeth
Btw lips/cheeks and teeth/gingiva when mouth is closed
What is the door for the Vestibule of the Oral Cavity?
Fissure= Mouth
What muscles control the size of an opened mouth?
Orbicularis Oris
Buccinators
Risorius
Where is the Oral Cavity Proper Located?
Btw Upper and Lower Dental Arches or arcades
Dental arch=alveolar process of maxillary bone and mandibular bone plus teeth
What is the Roof of the Oral Cavity Proper?
Palate
What is the Floor of the Oral Cavity Proper?
Tongue
What are the Anterior and Lateral Walls of the Oral Cavity Proper?
Alveolar Processes of Teeth
What is the Posterior Part of the Oral Cavity Proper?
No wall but goes to another space= Oropharynx
What 2 parts can Gingiva be divided into?
- Gingiva Proper
2. Gingiva Mucosa
What kind of Gingiva is easily moved and attached to soft tissue like fat and muscles?
Gingiva Mucosa= it’s soft and shiny
What Gingiva is firmly attached to the alveolar process of the jaws and teeth?
Gingiva Proper
What two bones does the word Jaw combine?
Mandibular Bone
Maxillary Bone
What color is Gingiva Proper? Why?
Pink
Keratinizing= Keratin protein
What type of protein is hard and protects soft tissue?
Keratin Protein
What is the tissue around the teeth called?
Periodontium
What is the function of Periodontium?
Hold teeth to bone
Incisor
Used for cutting
Canine
Used for cutting
Premolar
Used for mince with 2 roots or cusps
Molar
Used for mince with 3+ cusps
3 Functions of Teeth?
- Cutting food
- Joining the development
- Participating in articulation
What are teeth set in?
Tooth Socket
Where are the teeth sockets located?
Alveolar Processes of maxillary and mandibular bones
What are the 3 surfaces of the Tooth Socket?
- Vestibular Surface (side)
- Lingual Surface (side)
- Occlusal Surface (top surface)
3 divisions of a tooth
- Crown
- Neck
- Root
What part of a tooth is exposed?
Crown
What part of a tooth is in the socket?
Root held by Periodontium
3 Parts of the root of a tooth
- Dentin
- Cement
- Enamel
What is the Pulp Cavity used for?
Holding Blood vessels, nerves and Connective Tissue
What part of the tooth is an Empty Cavity?
Pulp Cavity
What part of the tooth sends blood vessels and nerves in or out of the Pulp Cavity?
Root Canal
What is the Apical Foramen?
Tip of the Root of a tooth
What is the Structure btw the tips of the root and socket?
Dento-Alveolar Syndesmosis or Gomphosis
What is btw the Cement of the Root and the Periosteum of the Alveolar Bone?
Periodontium
Where are Tactiles and Pressoreceptor Nerve Endings located that accept pressure changes?
Periodontium
What Arteries and Veins supply the Teeth?
Superior & Inferior Alveolar a + v
Lymph of Teeth
Submandibular Lymph Nodes
What Plexus supplies the teeth?
Dental Plexus (sensory?)
What forms the Dental Plexus?
Superior Alveolar n from Maxillary n
Inferior Alveolar n from Mandibular n
What are the teeth of young children?
Primary Teeth
Deciduous Teeth
What are the teeth of adults?
Secondary Teeth
Permanent Teeth
of Deciduous Teeth?
20
of Permanent Teeth?
32
Where do Permanent teeth sit before coming through?
Alveolar Arch
AKA Tooth Buds
What is the floor of the Nasal Cavity?
Palate
What are the 2 parts of the Palate?
- Hard Palate
2. Soft Palate
What is the Anterior 2/3 part of the Palate?
Hard palate
Hard Palate is formed by…
Palatine process of Maxillary bone and Horizontal Plates of Palatine Bone
What is posterior to the Incisive teeth?
Incisive Fossa
What is deep to the Incisive Fossa?
Incisive Canal
What passes thru the Incisive Canal to enter the mouth?
Nasopalatine Artery
What is Medial to the 3rd Molar teeth?
Greater Palatine a + n
from Greater Palatine Foramen
Greater Palatine a + n Travel thru what Foramen?
Greater Foramen
What part of the palate is Posterior and has no bones?
Soft Palate
What Connective Tissue is located in the Soft Palate
Palatine Aponeurosis
What is the Conical Process of the Soft Palate?
Uvula
What part of the palate squeezes the bolus of food into the back of the mouth?
Soft Palate
What closes the Pharynx to prevent food from getting into the Nasal Cavity?
Soft Palate
What 2 arches are connected by the Soft Palate?
- Palatoglossal Arch
2. Palatopharyngeal Arch
What does Fauces mean?
Narrow Space
What is the Space in the back of the Oral Cavity called? Between the Cavity and the Pharynx
Fauces
What are the 3 Boundaries of the Fauces?
- Soft Palate
- Root of the Tongue
- Pillars of the Fauces
Where is the Tonsillar Sinus (Fossa) Located?
Btw Palatoglossal Arches and Palatopharyngeal arches/ tongue
Where is the Palatine Tonsil located? What is it?
Inside Tonsillar Sinus
Mass of Lymph tissue
What is the surface of the Palate?
Mucosa
Where is the Palatine Gland located?
Under the Palate
How many Muscles are of the Soft Palate?
5
What are the 5 Muscles of the Soft Palate?
- Tensor Veli Palatine
- Levator Veli Palatine
- Palatoglossus
- Palatopharyngeus
- Musculus Uvulae
Where do the Muscles of the Soft Palate Attach and Insert?
Attach at base of Cranium or Palate
Insert in Soft Palate
What do the muscles of the soft palate do?
Elevate
Depress
What are the artery and vein of the Palate?
Greater & Lesser Palatine a + v
What are the 2 sensory nerves of the Palate?
- Greater Palatine Nerve
2. Lesser Palatine Nerve
What are the Greater and Lesser Palatine Nerves branches of?
Maxillary Nerve
How do the Greater/Lesser Palatine Nerves travel?
Thru Pterygopalatine ganglion thru the Greater/Lesser Palatine Foramen and to the Palate
What does the Greater Palatine Nerve Supply?
Gingiva
Mucosa
Glands
What does the Lesser Palatine Nerve supply?
Soft Palate
All muscles of soft palate except the Tensor Veli Palatine m are innervated by?
Pharyngeal Plexus of Vagus Nerve= MOTOR
Tensor Veli Palatine m is innervated by?
Medial Pterygoid n (branch of mandibular)
How many parts is the tongue divided into?
2
Root
Body
The root of the Tongue is what part?
Posterior 1/3
The Body of the Tongue is what part?
Anterior 2/3
What are the 3 surfaces of the tongue?
- Apex
- Dorsum
- Inferior Surface
What part of the tongue rests on the floor of the Oral Cavity?
Root
What is the AKA of Root of Tongue?
Posterior third of the tongue
Pharyngeal part
What part of the Tongue is easy to move?
Body
What is the AKA of the Body of the Tongue?
Anterior two third of the tongue
Oral Part
What is the anterior tip of the Tongue?
Apex
What is the Superior Surface of the Tongue?
Dorsum
5 structures on Dorsum of Tongue
- Terminal Sulcus
- Foramen Cecum
- Lingual Papillae
- Midline Groove of the Tongue
- Lingual Nodules (AKA Lymphoid Nodules/ Lingual Tonsil)
What is the Terminal Sulcus of the Tongue?
V-Shaped groove
What is the Foramen Cecum of the Tongue?
Small Pit
Remnant of Proximal part of the Embryonic Thyroglossal duct
What is the Lingual Papillae of the Tongue?
Make the surface of the tongue rough
4 kinds of Lingual Papillae
- Foliate
- Vallate
- Filiform
- Fungiform
Vallate Papilla
Large Top is Flat Directly Anterior to Terminal Sulcus Surrounded by Deep Trenches Taste buds on wall
Foliate Papilla
Small Long Shape
Two sides of tongue (Longitudinally)
Filiform Papilla
Dorsum of tongue
Small
Fungiform Papilla
Btw Filiform Papilla
Look like Mushrooms
Deep red color
What 3 Lingual Papillae have taste receptors?
Vallate
Foliate
Most of Fungiform
Lingual Tonsil
Lots of Lingual Nodules
No Papilla
Describe the Inferior Surface of Tongue
Covered by Mucous Membrane
Transparent Mucosa= see veins
Sublingual Caruncle
Located on each side of the Frenulum of the Tongue
Opening for Submandibular Duct here
2 groups of muscles of the tongue
- Extrinsic
2. Intrinsic
4 Extrinsic m of tongue
- Genioglossus
- Hyoglossus
- Styloglossus
- Palatoglossus
Genioglossus m
Anterior part depressing
posterior part protruding
Hyoglossus m
Depresses
Styloglossus m
Retrudes
Palatoglossus m
Elevates Posterior part
Where do the Extrinsic m of tongue come from?
Outside of the tongue and attach to the tongue
What are the Extrinsic m of the tongue used for?
Changing Position of the tongue
4 Intrinsic m of tongue
- Superior Longitudinal
- Inferior Longitudinal
- Transverse
- Vertical
Superior Longitudinal m
Shortening
Inferior Longitudinal m
Shortening
Transverse m
Narrowing
Vertical m
Flattening
What are Intrinsic m of tongue used for?
Changing shape of the tongue
These muscles are all within the tongue/mouth do not come from outside
What are the 4 sensory n of the tongue?
V
VII
IX
X
Innervates all m of tongue except Palatoglossus m
Hypoglossal nerve (XII) Motor
Pharyngeal Plexus of Vagus Nerve innervates which m of the tongue?
Palatoglossus m
2 sensations of the tongue
General
Special
General Sensation
Touch
Temperature
On mucosa
Special Sensation
Taste on Papillae of Mucosa Sweet Sour Salty Bitter
Sweetness
Apex
Saltiness
Lateral margins
Sourness/Bitterness
Posterior Part of tongue
Controls General Sensation
Innervates Anterior 2/3 of mucosa of tongue
Lingual Nerve of CN V
Controls Special Sensation
Innervates Anter 2/3 of mucosa of tongue
Chorda Tympani Nerve of CN VII
Controls both General & Special Sensation
Posterior 1/3 of tongue
Vallate Palate
Lingual Branch of CN IX (Glossopharyngeal n)
Control General & Special Sensation
Small area Anterior to Epiglottis of the Tongue
Internal Laryngeal Nerve of CN X
Penetrate Larynx go to root of tongue
What 3 nerves have branches to the tongue for special sensation?
- Facial
- Glossopharyngeal
- Vagus
Artery to Tongue
Lingual Artery
Supply Anterior Part of Tongue
Deep Lingual Arteries
Supply Posterior Part of Tongue
Dorsal Lingual Arteries
Where do veins of tongue go?
IJV directly or indirectly….
Lymph of Tongue
Submandibular Lymph Nodes
Submental Lymph Nodes
3 Salivary Glands
- Parotid
- Sublingual
- Submandibular
Where are smaller glands located?
Palate
Lips
Cheeks
Tongue
4 Functions of smaller glands
- keep moist
- lubricate food, make swallowing easy
- digest the starch but not protein
- mouth washing
Where is the Submandibular Gland Located?
Submandibular Triangle
How long is the Submandibular duct?
5 cm
This duct has openings on a small sublingual papilla, just beside the lingual frenulum
Submandibular Gland
What artery supplies the submandibular gland?
Submental Artery
Lingual n loops under duct
Located btw mandible and the genioglossus m
Sublingual Gland
Artery/ Nerve for Sublingual gland
Lingual a
N= same as submandibular gland
Small Pyramidal- shape space
Pterygopalatine Fossa
This space is under the apex of the orbit and very deep
Pterygopalatine Fossa
Roof of Pterygopalatine Fossa
Greater wing and inferior orbital fissure
Floor of Pterygopalatine Fossa
Pyramidal process of the palatine bone and palatine foramina
Anterior Pterygopalatine Fossa
Maxilla
Posterior Pterygopalatine Fossa
Pterygoid Process of Sphenoid
Lateral Pterygopalatine Fossa
Pterygomaxially fissure
Medial Pterygopalatine Fossa
Perpendicular plate of the palatine bone
Lateral Communication of Pterygopalatine fossa
Infratemporal Fossa by Pterygomaxiallary fissure
Medial Communication of Pterygopalatine fossa
Nasal cavity by Sphenopalatine foramen
Anterosuperior Communication of Pterygopalatine fossa
Orbit by inferior orbital fissure
Posterosuperior communication of Pterygopalatine fossa
Middle Cranial Fossa by Foramen Rotundum and Pterygoid canal
Inferior Communication of Pterygopalatine Fossa
Oral cavity by palatine canal, greater/lesser palatine foramen
3 contents of Pterygopalatine fossa
- terminal part of maxillary artery
- maxillary nerve
- pterygopalatine ganglion
What’s the roof of the Pterygopalatine fossa?
Greater wing and inferior orbital fissure
What’s the floor of the Pterygopalatine fossa?
Pyramidal process of the palatine bone
Anterior boundary of Pterygopalatine fossa?
Maxilla
Posterior Boundary of Pterygopalatine fossa?
Pterygoid process of the sphenoid
Lateral boundary of Pterygopalatine fossa?
Pterygomaxillary fissure
Medial Boundary of Pterygopalatine fossa?
Perpendicular plate of Palatine
What does the Pterygopalatine fossa communicate with laterally?
Infratemporal fossa by pterygomaxillary fissure
What does the Pterygopalatine fossa communicate with medially?
Nasal cavity by sphenopalatine
What does the Pterygopalatine fossa communicate with anterosuperiorly?
Orbit by inferior orbital fissure
What does the Pterygopalatine fossa communicate with posterosuperiorly?
middle cranial fossa by foramen rotundum and pterygoid canal
What does the Pterygopalatine fossa communicate with inferiorly?
oral cavity by palatine canal
Branches of the pterygopalatine part of the maxillary artery (6)?
- Posterior superior alveolar a
- infraorbital a
- artery of pterygoid canal
- pharyngeal a
- descending palatine a
- sphenopalatine
Where does the maxillary n enter the pterygopalatine fossa?
Foramen Rotundum
What does the Zygomatic n divide into?
- Zygomaticofacial
2. Zygomaticotemporal
Pterygopalatine n suspend what structure?
Pterygopalatine ganglion
What nerve is the main trunk of the maxillary n?
Infraorbital n
Where does the greater petrosal nerve originate?
facial
What are the 4 functions of the nose?
- Part of respiratory tract
- Moisturize and warm inspired air
- Filtrate dust
- Receive and eliminate the secretions from the paranasal sinuses and nasolacrimal duct
What are the 5 parts of the external nose?
- Dorsum
- Root
- Apex
- Nares (nostrils)
- Alae (wings)
What are the bones of the external nose?
Nasal
Frontal process of the maxilla
Nasal part of the frontal bone
What are the 3 cartilages of the external nose?
- Septal
- Alar
- lateral
What kind of gland is in the skin of the nose?
Sebaceous
What are the bones of the nasal septum called?
Vomer
Perpendicular plate of the Ethmoid
What is the Anterior boundary of the Nasal Cavity?
Nares
What is the Posterior Boundary of the Nasal Cavity?
Chonchae
Nasopharynx
What is the Roof of the Nasal Cavity?
Nasal
Frontal
Ethmoid
Sphenoid Bones
What is the Floor of the Nasal Cavity?
Palatine process of maxilla
Horizontal plates of palatine bone
What is the medial boundary of the nasal cavity?
Nasal septum
What is the lateral boundary of the nasal cavity?
Nasal Chonchae