Oral Cavity Flashcards
Oral Cavity
Roof
Floor
Lateral walls
Anterior aperture
Posterior aperture
- roof
- Hard palate and soft palate
- Floor
- Soft tissue
- Muscles
- Tongue
- Lateral walls
- Cheeks
- Anterior aperture
- Oral fissure
- Posterior aperture
- Oropharyngeal isthmus
- Opening into pharynx
Cheeks
random facts
- Parotid papilla
- In cheek opposite 2nd molars
- Pterygomandibular raphe is posterior border
Cheeks innervation
Motor
Sensation
- Motor
- Buccal branch of CN 7
- Sensory
- Buccal branch of CN V3
Innervation for oral cavity
Sensory
Special sensory
- Sensory
- CN V2 and CN V3
- Taste
- CN 7 and 9 hitchhiking on CN 5
Innervation of oral cavity
Motor tongue
motor muscle of soft palate
- Motor tongue
- CN 10 12
- Mostor soft palate
- CN 10 and CN V3
Floor of oral cavity
4
- Mylohyoid
- Muscular diaphragm
- Geniohyoid
- superior to mylohyoid
- tongue
- sup to geniohyoid
- Salivary glands and ducts
Gate way into oral cavity
Borders
(Same as 2nd pharyngeal aperture)
- Mylohyoid
- Superior constrictor
- Middle constrictor
Gateway to floor of oral cavity
what passes through
muscles3
1
arteries and veins 3
Nerves 3
lymphatics
- Styloglossus, stylopharyngeus, hyoglossus
- Styloid ligament
- Lingual art and vein (from facial), tonsilar art
- Lingual n, glossopharyngeal n, hypoglossal n.
- Submandibular lymph node
tongue
forms part of
root attached to
divided into
- Forms oral cavity floor, anterior wall of oropharynx
- Root attached to mandible and hyoid
- Divided into 2 parts
- Body/oral part, movable
- ant 2/3
- keratinized stratified squamous epithelium
- Root or pharyngeal part, non movable
- Post 1/3
- Non-keratinized stratified squamous epithelium
- Body/oral part, movable
2 Sulcus of tongue
- Median sulcus (raphe)
- Divides anterior tongue into l and r
- Ends a formen cecum
- Terminal sulcus
- V shaped
- Border between body and pharyngeal portions
- Circumvallate papilla
- Foramen cecum
- initial developmental site for thyroid
tongue
tonsils
folds
- Lingual tonsils
- cover the root, dorsum of tongue
- lymphoid follicles
- each with a single crypt
- Glossoepigottic folds
- Mucous membranes
- Connect root of tongue with epiglotti
Filiform 7
- Strong causes friction
- Rough texture
- Forms rows
- No tastebuds
- Avascular (all other are)
- Keratinized (only one)
- Most numerous
Fungiform
4
- Mushroom shaped
- concentrated on tongue margins
- taste buds CN 7
- Non-keratinized
Vallate or circumvallate
5
- Just one row of them
- Largest papillae
- least numerous (V shaped)
- Many taste buds CN 9
- Von Ebner glands (serous)
Foliate 4
- Sides of tongue
- Rudimentary/unfunctional
- Usually no taste buds
- non keratinized
Gustatory sensation of tongue
- Anterior 2/3
- CN facial 7
- Post 1/3
- CN 9 glossopharyngeal
Inferior surface of tongue
3 structures
- Lacks papillae
- Lingual frenulum
- Overlies sagittal septum
- Connects ventral surface of tongue to floor of mouth
- Sublingual papilla/ caruncle
- Swelling on side of frenulum
- Opening for submandibular glands
- Continous with sublingual folds
- Rough fimbriated folds
- Lateral to frenulum
Inferior tongue veins
Deep lingual veins
target for medications
rapid absorption
nitroglycerin
Diff bte extrinsic and intrinsic tongue movement
- Extrinsic- moves the tongue
- Intrinsic changes the shape
List the 4 extrinsic tongue muscles and innervations
- Genioglossus 12
- Hyoglossus 12
- Styloglossus 12
- Palatoglossus 10
Genioglossus
O
I
A
N
what passes btw this and another muscle
clinical note
- O
- superior mental spines (genial tubercle)
- I
- body of tongue, hyoid bone
- A
- protracts and depresses center of tongue
- N CN 12
- lingual artery is btw the genioglossus and hyoglossus
- if paralyzed then tongue deviates to injured side
Hyoglossus
o
I
a
n
What enters tongue ____to hyoglossus
what kind be found on____ surface
- O body and greater horn of hyoid
- I lateral tongue
- action- depresses and retracts tongue
- CN 12
- Lingual artery enters tongue deep medial to hyoglossus, between genioglossus and hyoglossus
- Lingual n. hyoglossal n. lingual vein and submandibular duct can be found on the lateral surface of hyoglossus
why is hyoglossus and imp landmark
- Lingual artery (ECA) enters tongue deep and medial to hyoglossus
- btw genio and hyoglossus
- CN 12, V3 ligual n. lingual vein and submandibular duct enter tongue on external lateral surface
Palatoglossus
o
I
A
N
- O Anterior surface of soft palate, palatine aponeurosis
- I lateral tongue
- A Elevates tongue
- depresses soft palate
- CN 10 via pharyngeal plexus
Styloglossus
o
i
a
n
- O styloid process
- I lateral tongue
- elevates and retracts tongue
- CN 12
- Smallest of extrinsic
Suprahyoid muscles 4
Digastric
Stylohyoid
Mylohyoid
Geniohyoid
Intrinsic Muscles of tongue
5
Superior longitudinal
Inferior longitudinal
Tranverse
Vertical
Median sagittal septum
Superior longitudinal muscle
A
N
- Shortens tongue
- curls apex and sides of tongue up
- CN 12
- Deep to surface of tongue
Inferior longitudinal muscle
a
n
location
- Shortens tongue
- curls apex down
- CN 12
- runs the length of the tongue
- between genioglossus and hyoglossus muscles
Tranverse muscle
a
n
location
Narrows and elongates tongue
CN 12
runs the width of the tongue
Vertical muscle
a
n
runs
- flattens and widens tongue
- CN 12
- runs from the superior and inferior tongue surfaces
Arterial suply to tongue
Lingual a. course
- Lingual a.
- Branches from ECA near greater horn of hyoid
- Forms upward bend
- Loops downward and forward to pass deep to hyoglossus m.
- follows with hyoglossus into floor of oral cavity
- travels forward btw hyoglossus and genioglossus to apex of tongue
Arterial supply to tongue
4 and location
- Dorsal lingual
- Post 1/3
- Deep lingual
- Ant 1/3
- Tonsilar branch (of facial)
- body of tongue
- Ascending pharyngeal of ECA
- body of tongue
Venous drainage of tongue
- Deep lingual veins
- can be seen under tongue
- travel with CN 12 and IJV
- Dorsal lingual vein
- Follows lingual a.
- Drains into IJV
Lymphatics of tongue
- Pharyngeal part
- Drains through pharyngeal wall
- Jugulodigastric nodes
- Oral part
- Submental, submandibular, deep cervical nodes
Innervation of tongue
Sensation
Taste
Motor
- Sensation
- Lingual n. of V3 (ant), CN 9 (post), CN 10 epiglottis
- Taste
- CN 7 (ant), CN 9(post) CN 10 (epiglottis)
- Motor 12
