Station 6 - The muscles of mastication Flashcards

1
Q

Name the muscles of mastications

A
  • Temporalis
  • Masseter
  • Medial pterygoid
  • Lateral pterygoid
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2
Q

Identfiy the following muscles:

  • Temporalis muscle
  • Masseter muscle
  • Medial pteryogid muslce
  • Lateral pterygoid muscle
A
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3
Q

What are the 2 bony attachments of the temporalis muscle?

A
  • Temporal fossa
  • Coronoid process of the mandible
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4
Q

State the actions of the temporalis muscle on the mandible (2)

A
  • Anteiror vertical fibres elevates the mandible
  • Posterior horizontal fibres retracts the mandible
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5
Q

What are the 2 bony attachments of the masseter muscle?

A
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6
Q

What is the action of masseter muscle of the mandible?

A

Elevates the mandible (to close the mouth)

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7
Q

The lateral pterygoid plate attaches to where on pterygoid plate?

A

The LATERAL surface of the LATERAL pterygoid plate

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8
Q

The medial pterygoid plate attaches to where on pterygoid plate?

A

The MEDIAL surface of the LATERAL pterygoid plate

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9
Q

The lateral pterygoid plate attaches to where on the mandible?

A

NECK of the condyloid process of the mandible (and also the articular disc of this joint)

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10
Q

The medial pterygoid plate attaches to where on the mandible?

A

RAMUS of the mandible

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11
Q

Contraction of the 2 lateral pterygoid muscles causes

A
  • Protrusion
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12
Q

Contraction of the lateral pterygoid muscle with the medial pterygoid muscle of the same side causes

A
  • Side to side movement
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13
Q

Contraction of the two medial pterygoid plates causes

A
  • Elevation
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14
Q

What muscles depress the mandible?

A
  • Mylohoid
  • Anteior belly of digasrtric
  • Geniohyoid

(all of these muscles are suprahyoid muscles)

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15
Q

All the muscles of mastication (temporalis, masseter, medial pterygoid and lateral pterygoid) are innervated by what nerve?

What type of fibres?

A
  • Branches of the mandibular division (V3) of the trigeminal nerve (CN V)
  • Motor and sensory fibres
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16
Q
  • Identify the ovale foramen (PIC)
  • What nerve emerges through this foramen?
A
  • Mandibular division of the trigeminal nerve