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ENT > Muscles Of Mastification > Flashcards

Muscles Of Mastification Flashcards

1
Q

What are the two muscles of facial expression

A

Orbicularis oris
Buccinator

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2
Q

Orbicularius oris location

A

enclose the opening to the oral cavity

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3
Q

Orbicularis oris actions

A

acts as a sphincter around the mouth

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4
Q

Orbicularis innervation

A

Facial nerve CN VII

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5
Q

Buccinator location

A

between the mandible and maxilla, deep to the other muscles of the face

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6
Q

Buccinator actions

A

assists in aligning a food bolus between the dentition

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7
Q

Buccinator innervation

A

facial nerve (CN VII)

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8
Q

What three surfaces articulate to form teh temporomandibular joint

A
  • mandibular fossa (of the temporal bone)
  • articular tubercle (squamous part of the temporal bone)
  • head of mandible (mandibular condyle)
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9
Q

What is the ‘upper part’ of the TMJ

A

the “upper part” refers to the section formed by the articular eminence of the temporal bone (part of the skull) and the articular disc

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10
Q

What is the function of the ‘upper part’ of the TMJ

A

Protrusion & retraction of the mandible

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11
Q

What is the ‘lower part’ of the TMJ

A

the “lower part” is the area between the articular disc (& mandibular fossa) and the mandibular condyle

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12
Q

What is the function of the ‘lower part’ of the TMJ

A

Elevation & depression of the mandible

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13
Q

What are the four muscles of mastication

A

Masseter
Temporalis
Medial pterygoid
Lateral pterygoid

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14
Q

What three muscle elevate the mandible i.e. close the mouth

A

Masseter
Temporalis
Medial Pterygoid

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15
Q

What muscle depresses & protracts the mandible i.e. opens the mouth

A

Lateral pterygoid

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16
Q

What innervates the muscles of mastication

A

CN V3 (mandibular division of trigeminal nerve)

17
Q

Masseter attachements

A

Proximal: Zygomatic arch (medial surface & inferior border). Distal: Lateral surface of angle and ramus of mandible

18
Q

Temporalis attachements

A

Proximal: the temporal fossa of the skull
Distal: the coronoid process of the mandible

19
Q

Medial pterygoid attachements

A

Superficial head origin: the maxillary tuberosity & the pyramidal process of palatine bone.

Deep head origin: the medial aspect of the lateral pterygoid plate of the sphenoid bone.

Attachment: the ramus of the mandible near the angle of mandible

20
Q

Lateral pterygoid attachments

A

Proximal - sphenoid bone
Distal - pterygoid fovea of the mandible, TMJ capsule & disc, and the condyle of the mandible

ENT (38 decks)

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