muscles of mastication and infratemporal foss Flashcards Preview

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

pterygoid fascia covers what to make what

clinical signif

A

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

2
Q

sphenomandibular ligament has what pass through it

A

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

3
Q

what are the muscles of mastication

A

Temporalis
masseter
pterygoids (medial and lateral)

4
Q

what is the pterygoid fascia continuous with

A

the stylomandibular ligament

5
Q

what are the muscles of mastication innervated by

A

the mandibular division of trigeminal nerve

-named according to corresponding muscle

6
Q

what is the arterial supply to the muscles of mastication

A

2nd part of the maxillary artery (pterygoid)

-named according to the corresponding muscle

7
Q

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

A

accessory muscle of mastication

  • if paralyzed, then food accumulates in vestibule area
  • branch of VII
8
Q

medial pterygoid in relationship to masseter muscle

A

located medial and parallel to the masseter musle

9
Q

function of medial pterygoid m

A

closes the jaw

10
Q

lateral pterygoid is ___ to the medial pterygoid

A

above

11
Q

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

A

superior: sphenomeniscus m, inserts on TMJ

lower head: inserts on pterygoid fossa of mandible

12
Q

what 2 structures run between the lateral pterygoid muscles

A

long buccal nerve and the maxillary artery

13
Q

what strucutes course between the medial and lateral pterygoids?

A

inferior alveolar and lingual nerves

14
Q

when the superior head of lateral pterygoid contracts what happens

A

moves articular disc forward and the head of the mandible forward

15
Q

steps of the jaw-jerk reflex

A
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
Q

normal opening of the mouth by

A

gravity

lateral pterygoid

17
Q

wide opening of the mouth

A

lateral pterygoid

suprahyoid muscles

18
Q

closing of the mouth

A

temporalis
masseter
medial pterygoid

19
Q

TMJ has 2 joints, describe each

A

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
Q

the articular disc is attached to what muscle

A

sphenomeniscus muscle (superior head lateral pterygoid m)

21
Q

importance of stylomandibular ligament

A

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

22
Q

changes in the mental angle with age

Newborn
4 year old child
adult
senior

A

newborn: 175

4 year old: 140

adult: 110-120
senior: 140

23
Q

fractures of the neck of the mandible may compromise

A

maxillary a and v, or auriculotemporal nerve

24
Q

fracture of the ramus of mandible may damage

A

lingual or inferior alveolar nerves

25
Q

fracture of the body of mandible would compress

A

inferior alveolar nerve and vessels

26
Q

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

A

the temporal-buccinator band

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

27
Q

what nerves goes right across the medial pterygoid

A

long buccal
inferior alveolar
lingual

28
Q

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

A

foramen ovale

29
Q

anterior part of mandibular division of trigeminal nerve convey what fibers

posteior part convey

A

SVE except buccal nerve (GSA)

posterior: GSA except nerve to mylohyoid muscle

30
Q

what nerve branches around the middle meningeal artery

A

auriculotemporal nerve

31
Q

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

A

lingual

32
Q

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

A

chorda tympani

33
Q

lingual nerve has ____ attached to it

A

submandibular ganglion

34
Q

what does the buccal nerve supply

A

GSA fibers to the epithelia of the inner and outer cheek

35
Q

3 parts of the maxillary artery

A

mandibular portion
pterygoid portion
sphenopalatine portion

36
Q

descending palatine artery supplies __ and signif

A

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

37
Q

branches of maxillary artery within sphenopalatine fossa

A

descending palatine
sphenopalatine
posterior septal
posterior lateral nasal

38
Q

branches of maxillary artery mandibular poritons

A
middle meningeal
inferior alveolar
posterior supeior alveolar
infraorbital
descending palatine