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Neuro I > Muscles of Mastication and Infratemporal Fossa > Flashcards

Muscles of Mastication and Infratemporal Fossa Flashcards

0
Q

Where does the temporalis muscle insert

A

cornonoid process of the mandible

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1
Q

The muscles of mastication develop from which branchial arch
what nerve innervates that arch
what artery supplies the muscles of mastication

A

1st branchial arch
trigeminal nerve (mandibular division V3) - named according to hte corresponding muscle
second part of maxillary artery (named according to corresponding muscle)

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2
Q

What covers the medial surface of the medial pterygoid and splits around the lateral pterygoid

A

pterygoid fascia

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3
Q

what is the pterygospinous ligament

A

may be formed by pterygoid fascia between the medial and lateral pterygoid muscles

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4
Q

the pterygoid fascia is continuous with the _______, ________, and the _______

A

stylomandibular ligament, deep parotid fascia, and the superficial fascia of the neck

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5
Q

In fracture dislocations of the mandible anterior to the angle of the mandible, what causes the proximal portion of the mandible to displace upward and forward?

A

the masseter muscle

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6
Q

What nerve innervates the buccinator muscle

A

CN VII

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7
Q

what is the buccinator’s role in mastication

A

pushes food onto chewing portion of the teeth,

if paralyzed, food is pushed between teeth and cheeks

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8
Q

what structures pass between the two heads of the lateral pterygoid

A

maxillary artery

long buccal nerve

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9
Q

what structures pass between the medial and lateral pterygoids

A

the inferior alveolar and lingual nerves

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10
Q

Describe the jaw jerk (masseteric) reflex mechanism

A

one synapse only
rapid depression of the chin
stretching neuromuscular spindle in masseter
maseteric nerve to mesencephalic nucleus of V (sensory nucleus)
motor nucleus of V
masseteric nerve to neuromuscular endplates in the masseter muscle
contraction of masseter muscle

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11
Q

what is the jaw jerk reflex

A

rapid depression of the chin results in a closing of the mouth

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12
Q

What is responsible for action of normal opening of the mouth

A

gravity,

lateral pterygoid

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13
Q

what muscles are responsible for wide opening of the mouth

A

lateral pterygoid,

suprahyoid

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14
Q

what muscles are responsible for closing the mouth

A

temporalis
masseter
medial pterygoid

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15
Q

How many different joint cavities make up the TMJ. What are they separated by?

A

to separate disks subdivided by an articular disk

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16
Q

What type of joint is the superior joint of the TMJ

A

gliding joint
between mandibular fossa and articular tubercle, and the articular disk
capsule is thin and loose to permit extensive sliding movement
MOBILE

17
Q

what type of joint is the inferior joint of the TMJ

A

hinge type joint between the articular disk and the mandibular condyle
lower capsule is strong and tight

18
Q

What is the articular disk of the TMJ attached to

A

the sphenomeniscus muscle and the strong lateral (collateral) ligament

19
Q

What ligament makes it much easier to open the mouth

A

stylomandibular ligament
from the apex of the syloid process to the inner surface of the angle of the mandible
biomechanically changes the transverse axis of rotation from a line between the mandibular condyles to a line between the lingulae

20
Q

What are two critical developments in the skull

A

development of dentition

development of paranasal sinuses

21
Q

Newborn has a mental angle of

why

A

175 degrees, because the alveolar bone is only a shell and the basilar bone is thin

22
Q

four year old child has a mental angle of

A

140 degrees

23
Q

adult has a mental angle of

why

A

110-120 degrees

due to the development of dentition

24
Q

What type of changes in the mental angle do we see in senior patients

A

regressive change in the mental angle to about 140 degrees.

an edentulous condition with corresponding alveolar bon resorption is causative

25
Q

Fracture of the neck of the mandible may compromise

A

maxillary artery
maxillary vein
or auriculotemporal nerve (sideburn anesthesia)

26
Q

fracture of the ramus of the mandible may damage

A

lingual or inferior alveolar nerves

27
Q

fracture of the body of the mandible would compress

A

the inferior alveolar nerve and vessels

28
Q

What is the terminal branch of maxillary artery

What does it supply

A

sphenopalatine artery

posterior 2/3 of the nasal cavity

29
Q

infratemporal fossa contains

A 
tendon of tempoalis muscle
medial and lateral pterygoid muscles
maxillary artery and branches
pterygoid venous plexus 
mandibular division of V (V3)
30
Q

What are the two terminal branches of external carotid artery

A

superficial temporal and maxillary

31
Q

what artery do we care about that is a branch of maxillary

why

A

middle meningeal artery

with head trauma it can cause epidural hematomas

32
Q

Know the mandibular nerve schematic

A

the angel diagram

33
Q

long buccal n passes between what muscle heads

A

the two heads of lateral pterygoid muscle

34
Q

where does the distal portion of buccal nerve course

A

deep to tempoprobuccinator band, a portion of the temporalis tendon that is attached to the buccinator muscle

35
Q

What does the buccal nevrve supply

A

GSA fibers to the epithelia of the inner and outer cheek

36
Q

What nerve originates as two roots which encircle the middle meningeal artery

A

the auriculotemporal nerve

37
Q

at the point where auriculo temporal nerve encircles the middle meningeal artery, it receives what sort of autonomic supply from where, and where do they terminate?

A

postganglionic sympathetic fibers from middle meningeal plexys, which will terminate in the parotid gland

38
Q

GSA to anterior 2/3 of the tongue

A

lingual nerve (V3)

39
Q

chorda tympany nerve joins lingual nerve where

A

medial to the mandibular condyle

40
Q

Chorda tympani courses with lingual nerve to supply

A

SVA fibers to the anterior 2/3 of tongue

GVE parasympathetic fibers to the submandibular and sublingual glands

Neuro I (30 decks)

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