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IOE Dentistry - Anatomy > Mastication > Flashcards

Mastication Flashcards

1
Q

What are the 4 muscles of mastication

A

Temporalis
Masseter
Medial pterygoid
Lateral pterygoid

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2
Q

What do all the muscles of mastication act around?

A

The temporomandibular joint

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3
Q

What disk is at the centre of the temporomandibular joint?

A

The articular disk

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4
Q

What is the Masseter Muscle attached to?

A

The zygomatic arch and the Ramus of the mandible

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5
Q

What is the action of the Masseter Muscle

A

To elevate the mandible for biting

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6
Q

Which nerve supplies the Masseter Muscle?

A

The mandibular nerve V3

Third division of the trigeminal nerve)

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7
Q

What is the temporalis muscle attached to?

A

The side of the skull and the coronoid process

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8
Q

What is the action of the temporalis muscle?

A

To close the mouth by:

  • Elevating the mandible using the vertical fibres
  • Retracts the mandible using horizontal fibres
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9
Q

Which nerve supplies the temporalis muscle?

A

The mandibular nerve V3

Third division of the trigeminal nerve)

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10
Q

What is the Medial Pterygoid Muscle attached to?

A

The lateral pterygoid plate of the sphenoid
Maxilla
Inner surface of the ramps of the mandible

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11
Q

What is the action of the Medial Pterygoid Muscle

A

Elevates the mandible

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12
Q

Which nerve supplies the Medial Pterygoid Muscle

A

The mandibular nerve V3

Third division of the trigeminal nerve)

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13
Q

What is the upper head of the Lateral Pterygoid Muscle attached to?

A

The upper head is attached to the sphenoid and articular disk of the TMJ

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14
Q

What is the action of the upper head of the Lateral Pterygoid Muscle

A

Upper head: Controls portions of the articular disk as mouth closes

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15
Q

What is the lower head of the Lateral Pterygoid Muscle attached to?

A

The lower head is attached to the condylar process of the mandible

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16
Q

What is the action of the lower head of the Lateral Pterygoid Muscle

A

The lower head pull the mandible anteriorly as mouth opens

17
Q

Which nerve supplies the Lateral Pterygoid Muscle

A

The mandibular nerve V3

Third division of the trigeminal nerve)

18
Q

Is the digastric muscle a muscle of mastication?

A

NO it does however assist the process

19
Q

What is the action of the digastric muscle?

A

Assists in opening the mouth

20
Q

What is the digastric muscle attached to?

A

The mastoid process

Hyoid bone

21
Q

Describe the digastric muscle

A

It has 2 muscle bellies: the posterior belly which is supplies by the facial nerve
The anterior bell which is supplies by the mylohyoid

22
Q

What is the mylohyoid?

A

A branch of the inferior alveolar nerve

23
Q

Describe the temporalis

A

It is a flat fan shaped muscle on the lateral side of the skull

24
Q

What is the origin of the temporalis

A

Temporal fossa

IOE Dentistry - Anatomy (10 decks)

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