Ear Houser Quiz

Question 1

What is the innervation pattern of the external auditory canal?

Answer 1

Nerve supply (somatosensory) is largely by the auriculotemporal nerve with vagus nerve hitting a small part near the tympanic membrane. (neurovasculature listed hits outer surface of tympanic membrane as well as external auditory canal)

Question 2

What is the innervation pattern of the tympanic membrane?

Answer 2

Tympanic membrane is innervated by:

• The auriculotemporal nerve on most of the outer surface
• A twig from the vagus nerve on outer surface at the posteroinferior part
• The tympanic plexus (mostly glossopharyngeal n.) on the inner surface

Question 3

Describe the arrangement of the auditory ossicles.

Answer 3

• The handle of the malleus is connected to the tympanic membrane
• The head of the malleus is connected to the body of the incus
• The lenticular process of the incus connects with the head of the stapes
• The base of the stapes connects with the oval window

Question 4

Describe the features of the pinna.

Answer 4

Question 5

Describe the features of the medial wall of the middle ear cavity.

Answer 5

Question 6

Describe the features of the posterior wall of the middle ear cavity.

Answer 6