External ear: auricle & auricular haematoma Flashcards

1
Q

how can the ear be split?

A

into 3 parts:

external, middle and inner

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2
Q

how can the external ear be split?

A
functionally and structurally split into two sections: 
the auricle (or pinna),  
the external acoustic meatus
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3
Q

what is the auricle?

A

an external, lateral paired structure

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4
Q

what is the function of the auricle?

A

capture and transmit sound to the external acoustic meatus

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5
Q

what does most of the auricle contain?

A

a cartilaganious framework

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6
Q

which is the only part of the external ear not supported by cartilage?

A

the lobule

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7
Q

what is the helix?

A

outer curvature of the ear

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8
Q

what is the antihelix?

A

Moving inwards from the helix, there is another curved elevation, which is parallel to the helix

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9
Q

what does the antihelix divide into?

A

two cura:
the inferoanterior crus
the superoposterior crus

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10
Q

what is the concha of auricle?

A

In the middle of the auricle is a hollow depression

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11
Q

what does the concha of auricle continue to? as?

A

It continues into the skull as the external acoustic meatus

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12
Q

what is the function of the concha?

A

acts to direct sound into the external acoustic meatus

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13
Q

what is the tragus?

A

Immediately anterior to the start of the external acoustic meatus is an elevation of tissue

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14
Q

what opposite the tragus?

A

antitragus

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15
Q

where does Cutaneous innervation to the skin of the auricle (cartilage external ear) come from?

A

the greater auricular, lesser occipital and branches of the facial and vagus nerves

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16
Q

why do patients complain of an involuntary cough when cleaning their ears?

A

this is due to stimulation of the auricular branch of the vagus nerve, the nerve responsible for the cough reflex

17
Q

With respect to the vasculature, what are the main vessels involved in supplying the auricle?

A

the posterior auricular, superficial temporal and occipital arteries and veins

18
Q

what is an auricular haematoma?

A

when blood collects between the cartilage and the overlying pericondrium

19
Q

how is an auricular haematoma normally caused?

A

trauma, contact sports

20
Q

what can auricular haematoma lead to?

A

the accumulation of blood in auricular haematoma can disrupt the blood supply to the cartilage of the auricle (diffusion, avascular tissue)

21
Q

what is ‘cauliflower ear’?

A

the gross deformity that occurs if the accumulation of blood within auricular haematoma is not drained quickly