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head and neck spot test > muscles of mastication > Flashcards

muscles of mastication Flashcards

1
Q

how many muscles of mastication are there?

A

4

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2
Q

what nerve innervates the muscles of mastication?

A

the mandibular branch of the trigeminal nerve

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3
Q

what is the function of the muscles of mastication?

A

move the mandible

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4
Q

what are the 4 muscles of mastication?

A

temporlais
masseter
lateral pterygoid
medial pterygoid

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5
Q

what is the largest muscle of mastication?

A

temporalis

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6
Q

why are there 2 dif muscle fibre orientations in temporalis?

A

anterior fibres to elevate the mandible
posterior fibres to retract the mandible

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7
Q

apart form temporalis what is the other superficial muscle of mastication?

A

masseter

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8
Q

what is the function of masseter muscle?

A

acts to elevate the mandible

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9
Q

describe the innervation of the masseter muscle

A

it is innervated by the mesenteric nerve from the anterior division of the mandibular division of the trigeminal nerve

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10
Q

what are the deeper muscles of mastication and where do they lie?

A

medial and lateral pterygoids

lie in the infratemporal fossa

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11
Q

describe the lateral pterygoid muscle

A

it has two heads and one of them attaches to the lateral surface of the lateral pterygoid plate

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12
Q

describe the innervation of the lateral pterygoid

A

it is innervated by the nerve to the lateral pterygoid from the anterior division of the mandibular division of the trigeminal nerve

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13
Q

describe the medial pterygoid

A

the deep head attaches to the medial side of the lateral pterygoid plate

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14
Q

how does the innervation of the medial pterygoid differ from other muscles of mastication?

A

the nerve supply to the medial pterygoid is from the main trunk of the mandibular division of the trigeminal nerve (before it bifurcates into anterior and posterior divisions)

the other muscles of mastication are supplied by the anterior division

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15
Q

what muscles are involved in elevation of the mandible?

A

temporlais
masseter
medial pterygoid

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16
Q

what muscles are involved in depression of the mandible?

A

lateral pterygoid
diagastric
genioyoid
mylohyoid

17
Q

apart from muscles what else is involved in depression of the mandible?

A

gravity

18
Q

what muscles are involved in protrusion of the mandible?

A

lateral pterygoid
medial pterygoid assits

19
Q

what muscles are involved in recursion of the mandible?

A

the posterior fibres of temporalis

20
Q

lateral chewing is achieved by which two movements combined?

A

protrusion and retrusion

21
Q

what muscle is involved in lateral chewing?

A

medial pterygoid
lateral pterygoids

head and neck spot test (18 decks)

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