Anatomy Of The Ear

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Sensory innervation - tympanic membrane & middle ear

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Tympanic membrane:

- External: CN V (V3: tensor tympani -> hearing regulation)

- Internal: CN IX

Middle ear:

- tympanic branch, CN IX -> plexus on promontory -> lesser petrosal n. (pS) -> parotid gland

CN VII branch (chorda tympani) travels through; n. to stapedius -> hearing regulation

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Blood supply of middle & inner ear

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Middle ear:

ICA & ECA -> branches via foramina -> tympanic cavity

Inner ear:

AICA (/basilary a.) -> labyrinthine artery via internal acoustic meatus

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Fx?

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pS -> submandibular & sublingual gland secretion

sensory <- taste from anterior 2/3 of tongue

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