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Anatomy 2 > Muscles of Mastication > Flashcards

Muscles of Mastication Flashcards

1
Q

What are the 4 muscles of mastication?

A
  1. Temporalis
  2. Masseter
  3. Medial pterygoid
  4. Lateral pterygoid
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2
Q

What are the 4 movements of the jaw?

A
  1. Protrusion
  2. Retrusion
  3. Elevation
  4. Depression
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3
Q

What is the origin of the masseter?

A

Zygomatic arch

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4
Q

What is the insertion of the masseter?

A

Ramus and angle of mandible

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5
Q

What is the nerve supply of the masseter?

A

Masseteric from ant. division of mandibular nerve

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6
Q

What are the 2 actions of the masseter?

A
  1. Elevation of mandible

2. Protrusion of mandible

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7
Q

What are the 3 origins of the temporalis?

A
  1. Temporal lines
  2. Temporal fossa
  3. Deep surface of temporal fascia
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8
Q

What is the insertion of the temporalis?

A

Coronoid process

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9
Q

What is the nerve supply of the temporalis?

A

Deep temporal nerve from ant. division of mandibular nerve

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10
Q

What is the action of the ant. fibres of the temporalis?

A

Elevation of mandible

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11
Q

What is the action of the post. fibres of the temporalis?

A

Retrusion of the mandible

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12
Q

What is the origin of the upper head of the lateral pterygoid?

A

Infratemporal surface of greater wing of sphenoid

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13
Q

What is the origin of the lower head of the lateral pterygoid?

A

Lateral surface of lateral pterygoid plate

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14
Q

What is the insertion of the upper head of the lateral pterygoid?

A

Join capsule and intraarticular disc

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15
Q

What is the insertion of the lower head of the lateral pterygoid?

A

Neck of the mandible (pterygoid fovea)

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16
Q

What is the nerve supply of the lateral pterygoid?

A

Ant. division of mandibular nerve

17
Q

What is the bilateral action of the lateral pterygoid?

A

Depression of the mouth

18
Q

What is the unilateral action of the lateral pterygoid?

A

Side to side movement of mandible

19
Q

What is the origin of the superficial head of the medial pterygoid?

A

Maxillary tuberosity

20
Q

What is the origin of the deep head of the medial pterygoid?

A

Medial surface of lateral pterygoid plate

21
Q

What is the insertion of the medial pterygoid?

A

Deep surface of ramus and angle of mandible

22
Q

What is the nerve supply of the medial pterygoid?

A

Trunk of the mandibular nerve

23
Q

What is the bilateral action of the medial pterygoid?

A

Elevation of mandible

24
Q

What is the unilateral action of the medial pterygoid?

A

Side to side movement of mandible

25
Q

What muscles of mastication cause the mandible to protract?

A
  1. Lateral pterygoid

2. Masseter

26
Q

What muscles of mastication cause the mandible to retract?

A
  1. Posterior fibres of temporalis
27
Q

What muscles of mastication cause the mandible to elevate?

A
  1. Masseter
  2. Medial pterygoid
  3. Anterior fibres of temporalis
28
Q

What muscles of mastication cause the mandible to depress?

A

Lateral pterygoid

Anatomy 2 (24 decks)

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