Ear Anatomy (extra)

Question 1

Blood supply to ear

Answer 1

Superficial temporal a.

Posterior auricular a.

Question 2

Innervation of ear

Answer 2

Great auricular n. (cervical plexus)
Auriculotemporal n. (V3)
Vagus n. auricular branches
Facial n.

Question 3

Which nerves innervate tympanic membrane?

Answer 3

Auriculotemporal n. (V3)

Branches from vagus n.

Question 4

What is anterior to the middle ear?

Answer 4

ICA

Question 5

What is inferior to middle ear?

Answer 5

IJV

Question 6

What is posterior to middle ear?

Answer 6

Facial n.

Question 7

What parts of the malleus and incus articulate?

Answer 7

The heads of both

Question 8

Where does the tensor tympani m. insert?

Answer 8

Handle of malleus

Question 9

What articulates with the head of stapes?

Answer 9

Long limb of incus

Question 10

Where does stapedius m. insert?

Answer 10

Neck of stapes

Question 11

PSNS to submandibular and sublingual glands

Answer 11

Chroda tympani n. (CN VII) rides along lingual n. (from V3) and synapses in submandibular ganglion. PSNS fibers follow arteries to get to glands

Question 12

PSNS to parotid gland

Answer 12

Tympanic n. (from CN IX) enters the jugular foramen, and eventually enters middle ear to form tympanic plexus. Lesser petrosal n. enters foramen ovale and synapses in otic ganglion. PSNS fibers ride along w/ auriculotemporal n. (V3) to get to parotid.

Question 13

Where does chorda tympani n. cross in the middle ear cavity?

Answer 13

Across the handle of the malleus