External ear (dave's notes) Flashcards

1
Q

Two words used for the external ear

A

Auricle/pinna

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2
Q

What does the auricle or pinna consist of?

A

A skeleton of resilient yellow cartilage, with vestigial intrinsic and extrinsic muscles supplied by the facial nerve

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3
Q

Describe the external acoustic meatus - length/wall size

A

~3cm long with the anteroinferior wall the longest and the posterosuperior wall the shortest

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4
Q

What tissues does the external acoustic meatus consist of?

A

Outer 1/3rd cartilage, inner 2/3rds bone

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5
Q

What is the boney part of the external acoustic meatus formed from?

A

The tympanic part of the temporal bone

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6
Q

What is the cartilaginous part of the external acoustic meatus rich in?

A

Hair and sebaceous glands

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7
Q

What is the arterial supply of the external ear and external acoustic meatus?

A

The posterior auricular and superficial temporal arteries

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8
Q

What is the nerve supply to the external ear and external acoustic meatus?

A

Great auricular, auriculotemporal, vagus and facial

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