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ANAT-316 > Lecture 12 - Mastication > Flashcards

Lecture 12 - Mastication Flashcards

1
Q

What attaches to the angle of the mandible?

A

muscles

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2
Q

What passes through the mandibular notch?

A

neurovasculature

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3
Q

What is the hole on the chin called?

A

mental foramen

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4
Q

What two parts make up the condylar process of the mandible?

A

head and neck of mandible

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5
Q

Which process articulates with the temporomandibular joint?

A

condylar process

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6
Q

What are the two processes on the ramus of the mandible?

A

condylar and coronoid process

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7
Q

How many teeth does a typical adult have?

A

32 (if wisdom teeth are in tact)

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8
Q

What are the 4 mandibular dentitions?

A
  1. incisors
  2. canines
  3. premolars
  4. molars
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9
Q

How many pairs of incisors are there?

A

4

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10
Q

How many pairs of canines are there?

A

2

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11
Q

How many pairs of premolars are there?

A

4

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12
Q

How many pairs molars are there?

A

6

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13
Q

What sits within the temporomandibular joint?

A

articular disk

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14
Q

What is the function of the articular disk?

A

reduces friction in the TMJ and facilitates movement

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15
Q

What are the 2 bones of the temporomandibular joint?

A

mandible and temporal bone

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16
Q

What part of the mandible contributes to the TMJ?

A

head

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17
Q

What 2 parts of the temporal bone contributes to the TMJ?

A

mandibular fossa and articular tubercle

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18
Q

What are the 3 ligaments that support the TMJ?

A
  1. lateral ligament
  2. stylomandibular
  3. sphenomandibular
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19
Q

Which ligament is a thickening of the joint capsule?

A

lateral ligament

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20
Q

What kind of joint is the TMJ?

A

modified synovial hinge joint

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21
Q

What 3 movements happen at the TMJ?

A

rotational (saggital + horizontal plane) and anteroposterior translational

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22
Q

What axis does rotational movement in saggital plane of the TMJ happen?

A

transverse axis

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23
Q

What axis does anteroposterior translational movement of the TMJ happen?

A

no axis

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24
Q

What axis does the rotational movement in horizontal plane of the TMJ happen?

A

vertical axis

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25
Q

Protrusion is ___ translation of the mandible.

A

anterior

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26
Q

Retraction is ___ translation of the mandible.

A

posterior

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27
Q

Depression is ___ rotation about the transverse axis.

A

downward

28
Q

What 2 actions happen during opening of the mouth?

A

protrusion and depression

29
Q

What 2 actions happen during closing of the mouth?

A

retraction and elevation

30
Q

What are the articular surfaces of the head of the mandible and mandibular fossa lined with?

A

fibrocartilage

31
Q

What is the TMJ joint cavity filled with?

A

synovial fluid

32
Q

When opening the mouth >15 degrees, the articular disc and head of mandible slide anteriorly beneath the ___.

A

articular tubercle

33
Q

When does TMJ dislocation occur?

A

when the head of the mandible passes anterior to the articular tubercle

34
Q

What can TMJ dislocation be related to?

A

excessive contraction of the lateral pterygoid muscle

35
Q

What actions can cause a TMJ dislocation?

A

big yawn, trying to eat a huge sandwich

36
Q

What kind of dislocation is uncommon?

A

posterior dislocation

37
Q

What are the 4 muscles of mastication?

A

masseter, temporalis, lateral pterygoid, medial pterygoid

38
Q

What is the action of the masseter muscle?

A

elevation and protrustion

39
Q

What is the innervation of the masseter?

A

CN V3 (masseteric nerve)

39
Q

What is the attachment of the masseter?

A

zygomatic arch to angle / lateral surface of ramus of mandible

40
Q

What is the action of the temporalis muscle?

A

elevation and retraction

41
Q

What is the attachment of the temporalis?

A

temporal fossa -> coronoid process of mandible

42
Q

What is the innervation of the temporalis?

A

CN V3 (deep temporal nerves)

43
Q

What is the action of the lateral pterygoid?

A

bilateral: protrusion
unilateral: lateral movement of contralateral side

44
Q

What is the attachment of the lateral pterygoid?

A

lateral surface of lateral pterygoid plate -> condylar process of mandible and articular disc of TMJ

45
Q

What is the innervation of the lateral pterygoid?

A

CN V3 lateral pterygoid nerve

46
Q

What is the action of the medial pterygoid?

A

elevation and protrustion

47
Q

What is the attachment of the medial pterygoid?

A

medial surface of lateral pterygoid plate and maxillary tuberosity -> angle and medial surface of ramus of mandible

48
Q

What is the innervation of the medial pterygoid?

A

CN V3 lateral pterygoid nerve

49
Q

What nerve provides motor innervation to the muscle of mastication?

A

mandibular division of the trigeminal nerve

50
Q

What foramen does CN V3 pass through to enter the infratemporal fossa?

A

the foramen ovale

51
Q

What is the temporal fossa connected inferiorly with?

A

the infratemporal fossa

52
Q

Where is the infratemporal fossa located?

A

deep to the ramus of the mandible

53
Q

What are the 6 boundaries of the temporal fossae?

A
  • Lateral: ramus of the mandible
  • Medial: lateral pterygoid plate
  • Anterior: posterior aspect of maxilla
  • Posterior: tympanic part of temporal bone + styloid process
  • Superior: inferior surface of greater wing of sphenoid
  • Inferior: attachment of medial pterygoid (angle of mandible)
54
Q

Adult dentition follows the same pattern of 8 teeth in each ___ of the mouth.

A

quadrant

55
Q

Where does the mandibular canal start and end?

A

mandibular foramen to mental foramen

56
Q

Where does maxillary neurovasculature travel through?

A

maxillary sinus

57
Q

Where does mandibular neurovasculature travel?

A

mandibular canal

58
Q

What nerve innervates the gums?

A

lingual nerve

59
Q

What nerve innervates mandibular teeth and gums?

A

inferior alveolar nerve

60
Q

What does the mental nerve innervate?

A

gums and skin of chin

61
Q

What do the superior alveolar nerves innervate?

A

maxillary teeth

62
Q

What artery branches into the inferior alveolar artery?

A

maxillary

63
Q

What are the 5 superficial structures of the ITF?

A

Superficial temporal a. + v.
Deep temporal a. + n.
Lateral pterygoid muscle
(superior & inferior heads)
Inferior alveolar a. + n.
Lingual n.

64
Q

What are the 5 deep structures of the ITF?

A
  1. superficial temporal artery and vein
  2. deep temporal nerve
  3. medial pterygoid muscle
  4. lingual nerve
  5. maxillary artery

ANAT-316 (25 decks)

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