ENT Otolaryngologic Anatomy 2

Question 1

Which nerve crosses the middle ear between the malleus and the incus, medial to the tympanic membrane?

Accepted Answer

Chorda tympani

Answer

The chorda tympani runs through the middle ear between the handle of the malleus and the long process of the incus before leaving through the petrotympanic fissure.

Question 2

Which nerve supplies the tensor tympani muscle?

Accepted Answer

Mandibular division of the trigeminal nerve

Answer

The tensor tympani comes from the first pharyngeal arch and is supplied by V3 through the nerve to the medial pterygoid.

Question 3

The stapedius muscle is supplied by which cranial nerve?

Accepted Answer

Facial (CN VII)

Answer

The stapedius comes from the second pharyngeal arch and is supplied by a branch of the mastoid segment of the facial nerve.

Question 4

Jacobson's nerve, which forms the tympanic plexus on the promontory, is a branch of which cranial nerve?

Accepted Answer

Glossopharyngeal nerve

Answer

Jacobson's nerve is the tympanic branch of CN IX; it carries the parasympathetic fibers that go on as the lesser petrosal nerve to the otic ganglion and parotid gland.

Question 5

A patient coughs when the posterior external auditory canal is cleaned. Which nerve causes this reflex?

Accepted Answer

Auricular branch of the vagus nerve

Answer

Arnold's nerve (the auricular branch of CN X) supplies the posterior canal wall, and stimulating it can trigger a cough reflex.

ENT - Ear, Nose, and Throat Specialist Certification Practice Test

ENT - Ear, Nose, and Throat Specialist Certification Practice Test

ENT Otolaryngologic Anatomy 2