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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
Protrusion is ___ translation of the mandible.
anterior
26
Retraction is ___ translation of the mandible.
posterior
27
Depression is ___ rotation about the transverse axis.
downward
28
What 2 actions happen during opening of the mouth?
protrusion and depression
29
What 2 actions happen during closing of the mouth?
retraction and elevation
30
What are the articular surfaces of the head of the mandible and mandibular fossa lined with?
fibrocartilage
31
What is the TMJ joint cavity filled with?
synovial fluid
32
When opening the mouth >15 degrees, the articular disc and head of mandible slide anteriorly beneath the ___.
articular tubercle
33
When does TMJ dislocation occur?
when the head of the mandible passes anterior to the articular tubercle
34
What can TMJ dislocation be related to?
excessive contraction of the lateral pterygoid muscle
35
What actions can cause a TMJ dislocation?
big yawn, trying to eat a huge sandwich
36
What kind of dislocation is uncommon?
posterior dislocation
37
What are the 4 muscles of mastication?
masseter, temporalis, lateral pterygoid, medial pterygoid
38
What is the action of the masseter muscle?
elevation and protrustion
39
What is the innervation of the masseter?
CN V3 (masseteric nerve)
39
What is the attachment of the masseter?
zygomatic arch to angle / lateral surface of ramus of mandible
40
What is the action of the temporalis muscle?
elevation and retraction
41
What is the attachment of the temporalis?
temporal fossa -> coronoid process of mandible
42
What is the innervation of the temporalis?
CN V3 (deep temporal nerves)
43
What is the action of the lateral pterygoid?
bilateral: protrusion unilateral: lateral movement of contralateral side
44
What is the attachment of the lateral pterygoid?
lateral surface of lateral pterygoid plate -> condylar process of mandible and articular disc of TMJ
45
What is the innervation of the lateral pterygoid?
CN V3 lateral pterygoid nerve
46
What is the action of the medial pterygoid?
elevation and protrustion
47
What is the attachment of the medial pterygoid?
medial surface of lateral pterygoid plate and maxillary tuberosity -> angle and medial surface of ramus of mandible
48
What is the innervation of the medial pterygoid?
CN V3 lateral pterygoid nerve
49
What nerve provides motor innervation to the muscle of mastication?
mandibular division of the trigeminal nerve
50
What foramen does CN V3 pass through to enter the infratemporal fossa?
the foramen ovale
51
What is the temporal fossa connected inferiorly with?
the infratemporal fossa
52
Where is the infratemporal fossa located?
deep to the ramus of the mandible
53
What are the 6 boundaries of the temporal fossae?
* 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
Adult dentition follows the same pattern of 8 teeth in each ___ of the mouth.
quadrant
55
Where does the mandibular canal start and end?
mandibular foramen to mental foramen
56
Where does maxillary neurovasculature travel through?
maxillary sinus
57
Where does mandibular neurovasculature travel?
mandibular canal
58
What nerve innervates the gums?
lingual nerve
59
What nerve innervates mandibular teeth and gums?
inferior alveolar nerve
60
What does the mental nerve innervate?
gums and skin of chin
61
What do the superior alveolar nerves innervate?
maxillary teeth
62
What artery branches into the inferior alveolar artery?
maxillary
63
What are the 5 superficial structures of the ITF?
Superficial temporal a. + v. Deep temporal a. + n. Lateral pterygoid muscle (superior & inferior heads) Inferior alveolar a. + n. Lingual n.
64
What are the 5 deep structures of the ITF?
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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