muscles of mastication and infratemporal foss Flashcards Preview

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Flashcards in muscles of mastication and infratemporal foss Deck (38):
1

pterygoid fascia covers what to make what
clinical signif

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

2

sphenomandibular ligament has what pass through it

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

3

what are the muscles of mastication

Temporalis
masseter
pterygoids (medial and lateral)

4

what is the pterygoid fascia continuous with

the stylomandibular ligament

5

what are the muscles of mastication innervated by

the mandibular division of trigeminal nerve
-named according to corresponding muscle

6

what is the arterial supply to the muscles of mastication

2nd part of the maxillary artery (pterygoid)
-named according to the corresponding muscle

7

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

accessory muscle of mastication
-if paralyzed, then food accumulates in vestibule area
-branch of VII

8

medial pterygoid in relationship to masseter muscle

located medial and parallel to the masseter musle

9

function of medial pterygoid m

closes the jaw

10

lateral pterygoid is ___ to the medial pterygoid

above

11

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

superior: sphenomeniscus m, inserts on TMJ
lower head: inserts on pterygoid fossa of mandible

12

what 2 structures run between the lateral pterygoid muscles

long buccal nerve and the maxillary artery

13

what strucutes course between the medial and lateral pterygoids?

inferior alveolar and lingual nerves

14

when the superior head of lateral pterygoid contracts what happens

moves articular disc forward and the head of the mandible forward

15

steps of the jaw-jerk reflex

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

16

normal opening of the mouth by

gravity
lateral pterygoid

17

wide opening of the mouth

lateral pterygoid
suprahyoid muscles

18

closing of the mouth

temporalis
masseter
medial pterygoid

19

TMJ has 2 joints, describe each

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

20

the articular disc is attached to what muscle

sphenomeniscus muscle (superior head lateral pterygoid m)

21

importance of stylomandibular ligament

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

22

changes in the mental angle with age

Newborn
4 year old child
adult
senior

newborn: 175

4 year old: 140

adult: 110-120

senior: 140

23

fractures of the neck of the mandible may compromise

maxillary a and v, or auriculotemporal nerve

24

fracture of the ramus of mandible may damage

lingual or inferior alveolar nerves

25

fracture of the body of mandible would compress

inferior alveolar nerve and vessels

26

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

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

27

what nerves goes right across the medial pterygoid

long buccal
inferior alveolar
lingual

28

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

foramen ovale

29

anterior part of mandibular division of trigeminal nerve convey what fibers

posteior part convey

SVE except buccal nerve (GSA)

posterior: GSA except nerve to mylohyoid muscle

30

what nerve branches around the middle meningeal artery

auriculotemporal nerve

31

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

lingual

32

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

chorda tympani

33

lingual nerve has ____ attached to it

submandibular ganglion

34

what does the buccal nerve supply

GSA fibers to the epithelia of the inner and outer cheek

35

3 parts of the maxillary artery

mandibular portion
pterygoid portion
sphenopalatine portion

36

descending palatine artery supplies __ and signif

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

37

branches of maxillary artery within sphenopalatine fossa

descending palatine
sphenopalatine
posterior septal
posterior lateral nasal

38

branches of maxillary artery mandibular poritons

middle meningeal
inferior alveolar
posterior supeior alveolar
infraorbital
descending palatine