muscles of mastication and infratemporal foss

Question 1

pterygoid fascia covers what to make what

clinical signif

Answer 1

covers medial pterygoid surface, splits around the lateral pterygoid
makes pterygospinous ligament
-ligament becomes calcified and can obstruct needle in maxillary nerve block

Question 2

sphenomandibular ligament has what pass through it

Answer 2

maxillary artery, vein, and auriculotemporal nerve between it and neck of mandible

Question 3

what are the muscles of mastication

Answer 3

Temporalis
masseter
pterygoids (medial and lateral)

Question 4

what is the pterygoid fascia continuous with

Answer 4

the stylomandibular ligament

Question 5

what are the muscles of mastication innervated by

Answer 5

the mandibular division of trigeminal nerve

-named according to corresponding muscle

Question 6

what is the arterial supply to the muscles of mastication

Answer 6

2nd part of the maxillary artery (pterygoid)

-named according to the corresponding muscle

Question 7

what kind of muscle is the buccinator muscle
what happens if paralyzed
what nerve innervates

Answer 7

accessory muscle of mastication

• if paralyzed, then food accumulates in vestibule area
• branch of VII

Question 8

medial pterygoid in relationship to masseter muscle

Answer 8

located medial and parallel to the masseter musle

Question 9

function of medial pterygoid m

Answer 9

closes the jaw

Question 10

lateral pterygoid is ___ to the medial pterygoid

Answer 10

above

Question 11

what is the 2 heads of the lateral pterygoid muscle called and insert

Answer 11

superior: sphenomeniscus m, inserts on TMJ

lower head: inserts on pterygoid fossa of mandible

Question 12

what 2 structures run between the lateral pterygoid muscles

Answer 12

long buccal nerve and the maxillary artery

Question 13

what strucutes course between the medial and lateral pterygoids?

Answer 13

inferior alveolar and lingual nerves

Question 14

when the superior head of lateral pterygoid contracts what happens

Answer 14

moves articular disc forward and the head of the mandible forward

Question 15

steps of the jaw-jerk reflex

Answer 15

rapid depression of chin
receptors: stretch of neuromuscular spindles in masseter 
afferent fibers course in masseteric n
mesencephalic nucleus of V
motor nucleus of V
efferent fibers in masseteric n
effector: neuromuscular endplates in masseter m
response: contraction of masseter m

Question 16

normal opening of the mouth by

Answer 16

gravity

lateral pterygoid

Question 17

wide opening of the mouth

Answer 17

lateral pterygoid

suprahyoid muscles

Question 18

closing of the mouth

Answer 18

temporalis
masseter
medial pterygoid

Question 19

TMJ has 2 joints, describe each

Answer 19

superior joint: gliding joint btwn mandibular fossa and articular tubercle
-permits sliding movement of head

inferior joint: hinge joint between articular disk and mandibular condyle

Question 20

the articular disc is attached to what muscle

Answer 20

sphenomeniscus muscle (superior head lateral pterygoid m)

Question 21

importance of stylomandibular ligament

Answer 21

changes transverse axis of roation from line between mandibular condyles to line between lingulae

Question 22

changes in the mental angle with age

Newborn
4 year old child
adult
senior

Answer 22

newborn: 175

4 year old: 140

adult: 110-120
senior: 140

Question 23

fractures of the neck of the mandible may compromise

Answer 23

maxillary a and v, or auriculotemporal nerve

Question 24

fracture of the ramus of mandible may damage

Answer 24

lingual or inferior alveolar nerves

Question 25

fracture of the body of mandible would compress

Answer 25

inferior alveolar nerve and vessels

Question 26

what do you have to identify to find the long buccal nerve

Answer 26

the temporal-buccinator band

-if cut this you will cut the long buccal nerve bc immediately adjacent to each other

Question 27

what nerves goes right across the medial pterygoid

Answer 27

long buccal
inferior alveolar
lingual

Question 28

the trunk of the mandibular division of trigeminal nerve passes through what

Answer 28

foramen ovale

Question 29

anterior part of mandibular division of trigeminal nerve convey what fibers

posteior part convey

Answer 29

SVE except buccal nerve (GSA)

posterior: GSA except nerve to mylohyoid muscle

Question 30

what nerve branches around the middle meningeal artery

Answer 30

auriculotemporal nerve

Question 31

what nerve supplies GSA sensory fibers to anterior 2/3 of tongue

Answer 31

lingual

Question 32

what nerve supplies taste (SVA) fibers to anterior 2/3 of tongue

Answer 32

chorda tympani

Question 33

lingual nerve has ____ attached to it

Answer 33

submandibular ganglion

Question 34

what does the buccal nerve supply

Answer 34

GSA fibers to the epithelia of the inner and outer cheek

Question 35

3 parts of the maxillary artery

Answer 35

mandibular portion
pterygoid portion
sphenopalatine portion

Question 36

descending palatine artery supplies __ and signif

Answer 36

supplies posterior 2/3 of nasal cavity, and hard to stop this nose bleed

Question 37

branches of maxillary artery within sphenopalatine fossa

Answer 37

descending palatine
sphenopalatine
posterior septal
posterior lateral nasal

Question 38

branches of maxillary artery mandibular poritons

Answer 38

middle meningeal
inferior alveolar
posterior supeior alveolar
infraorbital
descending palatine