Muscles of Mastication and Infratemporal Fossa Flashcards Preview

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Flashcards in Muscles of Mastication and Infratemporal Fossa Deck (41)
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The muscles of mastication develop from which branchial arch
what nerve innervates that arch
what artery supplies the muscles of mastication

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

1

Where does the temporalis muscle insert

cornonoid process of the mandible

2

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

pterygoid fascia

3

what is the pterygospinous ligament

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

4

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

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

5

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?

the masseter muscle

6

What nerve innervates the buccinator muscle

CN VII

7

what is the buccinator's role in mastication

pushes food onto chewing portion of the teeth,
if paralyzed, food is pushed between teeth and cheeks

8

what structures pass between the two heads of the lateral pterygoid

maxillary artery
long buccal nerve

9

what structures pass between the medial and lateral pterygoids

the inferior alveolar and lingual nerves

10

Describe the jaw jerk (masseteric) reflex mechanism

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

11

what is the jaw jerk reflex

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

12

What is responsible for action of normal opening of the mouth

gravity,
lateral pterygoid

13

what muscles are responsible for wide opening of the mouth

lateral pterygoid,
suprahyoid

14

what muscles are responsible for closing the mouth

temporalis
masseter
medial pterygoid

15

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

to separate disks subdivided by an articular disk

16

What type of joint is the superior joint of the TMJ

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

17

what type of joint is the inferior joint of the TMJ

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

18

What is the articular disk of the TMJ attached to

the sphenomeniscus muscle and the strong lateral (collateral) ligament

19

What ligament makes it much easier to open the mouth

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

What are two critical developments in the skull

development of dentition
development of paranasal sinuses

21

Newborn has a mental angle of
why

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

22

four year old child has a mental angle of

140 degrees

23

adult has a mental angle of
why

110-120 degrees
due to the development of dentition

24

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

regressive change in the mental angle to about 140 degrees.
an edentulous condition with corresponding alveolar bon resorption is causative

25

Fracture of the neck of the mandible may compromise

maxillary artery
maxillary vein
or auriculotemporal nerve (sideburn anesthesia)

26

fracture of the ramus of the mandible may damage

lingual or inferior alveolar nerves

27

fracture of the body of the mandible would compress

the inferior alveolar nerve and vessels

28

What is the terminal branch of maxillary artery
What does it supply

sphenopalatine artery
posterior 2/3 of the nasal cavity

29

infratemporal fossa contains

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