Parotid region (dave's notes) Flashcards

1
Q

What muscle is found in the parotid region?

A

Masseter

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2
Q

What is the origin and insertion of the superficial part of masseter?

A

Superficial part arises from the anterior 2/3rds of the lower border of the zygomatic arch
Fibres slope down at 45’ and insert into a wide area from the mandible angle upwards and forwards. Fibres fuse anteriorly but are separated posteriorly

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3
Q

What is the origin of the intermediate part of masseter?

A

Arises from the middle 1/3rd of the zygomatic arch

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4
Q

What is the origin and insertion of the deep part of masseter?

A

From the deep surface of the arch. Fibres pass vertically downwards into the ramus of the mandible

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5
Q

What is the upper part of masseter covered in? How does this differ from the lower half?

A

Upper part is covered in aponeurotic fibres (to aid with gliding). The lower half is fleshy.

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6
Q

What is the nerve supply to masseter? Where is it found?

A

Masseteric nerve runs down between the deep and intermediate parts

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7
Q

What is the blood supply to masseter? What is its course?

A

A branch of the superficial temporal or transverse artery runs forward between the superficial and intermediate parts. Intersecting artery.

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8
Q

What is the nerve supply to masseter?

A

The masseteric branch fro the anterior division of the mandibular nerve.

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9
Q

What is the action of masseter?

A

Action is to close the jaw by elevating and drawing forwards the angle of the mandible.

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