Lectures 27-28 Flashcards
Masseter origin/insertion
O: zygomatic arch
I: lateral surface of ramus, angle, and body of mandible
strongest muscle in the body
masseter
innervation of mastication (chewing muscles)
motor portion of mandibular division (V3) of trigeminal nerve (CN 5)
temporalis origin/insertion
O: temporalis fossa of temporal bone
I: coronoid process of mandible
medial pterygoid origin/insertion
O: between medial and lateral pterygoid plates
I: medial surface of ramus, angle, and body of mandible
lateral pterygoid origin/insertion
O: lateral pterygoid plate
I: anterior neck of mandibular condyle
2 things that always occur when the jaw is opened
- condyle is placed anteriorly (jaw partially dislocates)
2. mandible is depressed
elevation of the mandible is mostly accomplished by the
masseter and medial pterygoid
the masseter and medial pterygoid form the ___, which suspends the mandible
mandibular sling
the lateral pterygoid causes the mandible to
protrude
suprahyoid group
mylohyoid, anterior belly of digastric, geniohyoid
ligaments of the TMJ
articular capsule, articular disk, temporomandibular ligament, stylomandibular ligament, sphenomandibular ligament
supplies sensation to the lower teeth and aveolar surface of the mandible, the chin
mandibular division via its inferior alveolar branch
the inferior alveolar nerve enters through the ___ and exits through the ___
mandibular foramen, mental foramen
the area medial to the ramus of the mandible
infratemporal fossa
the pterygoid plexus communicate with the
inferior ophthalmic vein
the inferior ophthalmic vein drains into the
cavernous sinus
the cavernous sinus drains into the ___ via the ___
sigmoid sinus, greater and lesser petrosal sinuses
formed by clumps of bacteria from an infection on the side of the face
cavernous sinus thrombus
anterior boundary of infratemporal fossa
maxilla
superior boundary of infratemporal fossa
greater wing of sphenoid
medial boundary of infratemporal fossa
lateral pterygoid plate
lateral boundary of infratemporal fossa
ramus of mandible
posterior boundary of infratemporal fossa
spine of sphenoid
contents of infratemporal fossa
maxillary artery and its branches, pterygoid plexus of veins, inferior alveolar nerve w/br. to mylohyoid, lingual nerve, medial and lateral ptergoid muscles, chordates tympani nerve, otic ganglion, auriculotemporal nerve
4 branches of V3
inferior alveolar n, lingual n, buccal n, auricultotemporal n
parts of the nose
free tip, root, external nares (nostrils) and ala
entrance of the nose
external nares (nostrils)
what the external nares are separated by
nasal septum
nasal septum consists of
anterior, cartilaginous part and posterior, bony part
bony framework of the nose includes
2 nasal bones, 2 frontal portions of maxillary bones, 2 nasal portions of frontal bone
opening to nose in cranium
piriform fossa
function of nasalis muscle
opens the nostrils
function of depresso septi muscle
stabilizes the septum
depression between the 2 ridges created in septum
philtrum
function of levator palpebrae superioris plaque muscle
scrunches nose
what divides the nasal cavity into right and left chambers
nasal septum
airway of the external nose
vestibule
skin to mucus membrane connection
limen nasi
2 other regions of nasal cavity
olfactory and respiratory regions
bones of nasal septum
perpendicular plate of ethmoid bone, vomer, perpendicular plate of palatine bone
floor of nasal cavity
palatine processes of maxillary bone and horizontal plates of palatine bone
roof of nasal cavity
cribriform plate of ethmoid bone
also known as turbinate bones; often found on lateral walls of nasal cavity
conchae
passageways of nasal cavity
meati
where sphenoid sinus drains
spheno-ethmoidal recess
bulge lying underneath the middle conchae, caused by the middle ethmoid air cells
ethmoid bulla
cleft lying underneath the middle conchae where the maxillary sinus, frontal sinus, and anterior ethmoidal air cells drain
hiatus semilunaris
opening for nasolacrimal duct
lacrimal apparatus
relieves tears that migrate medially across conjunctiva
lacrimal gland
collects tears
lacrimal lake
red tissue in lake
lacrimal caruncle
on medial eye lid, small bump
lacrimal papillae
from puncta to sac
lacrimal canaliculi
to nasolacrimal duct
lacrimal sac
drains into nasal cavity; nose runs when you cry
nasolacrimal duct
supply nasal cavity for sense of smell
olfactory nerves
sensation is supplied by branches of the
trigeminal nerve
present for the control of secretions and blood flow
sympathetic/parasympathetic innervation
primary blood flow to the nasal cavity is via the posteriorly entering ___ artery
sphenopalatine
branches of sphenopalatine artery
anterior and posterior ethmoidal arteries, greater palatine artery, nasal br. of facial artery
give resonance to the voice and lighten the skill
paranasal sinuses
