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PNS final > ear pt 2 > Flashcards

ear pt 2 Flashcards

1
Q

what is the shape and length of the external acoustic meatus?

A

1in and S shaped

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2
Q

what portion of the external acoustic meatus is in the temporal bone?

A

medial 2/3

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3
Q

what do the modified sweat glands of the external acoustic meatus produce?

A

cerumen

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4
Q

where does the external acoustic meatus terminate?

A

tympanic membrane

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5
Q

what is the blood supply to the external ear?

A

External carotid artery- posterior auricular branch
Superficial temporal artery- anterior auricular branch
Occipital artery- auricular branch

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6
Q

what is the SENSORY supply to external ear? (3)

A

Auriculotemporal nerve opthalmic division trigeminal
Auricular branch Vagus
Great auricular nerve (C2-3)

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7
Q

what is the MOTOR supply to external ear?

A

temporal and posterior auricular branches of facial nerve

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8
Q

what is the SYMPATHETIC supply of external ear?

A

superior cervical ganglion

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9
Q

where is middle ear located?

A

btw tympanic membrane and inner ear

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10
Q

what are the 3 bones of the middle ear/tympanic cavity?

A

incus, malleus, stapes

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11
Q

what are the 2 muscles located in the tympanic cavity of middle ear?

A

stapedius and tensor tympani

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12
Q

which is the largest bone of the tympanic cavity and comes in contact with tympanic membrane?

A

malleus

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13
Q

which bone transmits vibration from malleus to stapes?

A

incus

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14
Q

which bone is the 3rd in sequence and sits against the oval window?

A

stapes

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15
Q

what is the blood supply to the middle ear?

A

Internal maxillary artery- anterior tympanic branch

Internal carotid artery- tympanic branch

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16
Q

what is the sensory supply to the middle ear?

A

tympanic nerve of glossopharyngeal

17
Q

what nerve supplies the stapedius muscle of the middle ear?

A

nerve to stapedius of facial nerve

18
Q

what nerve supplies the tensor tympani muscle of the middle ear?

A

medial pterygoid nerve, mandibular division, trigeminal

19
Q

what is the sympathetic supply of the middle ear?

A

caroticotympanic nerves carry vasomotor and secretomotor fibers from SUPERIOR CERVICAL GANGLION by way of INTERNAL CAROTID PLEXUS

PNS final (3 decks)

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