Question

chapter 15 multiple choice question 28
1 part | -- of 1 point

which of the following structures is not part of the external ear?

○ pharyngotympanic tube
○ tympanic membrane
○ pinna
○ external acoustic meatus

check answer

Explanation:

To solve this, we recall the anatomy of the ear. The external ear consists of the pinna, external acoustic meatus, and tympanic membrane (eardrum) is the boundary between external and middle ear. The pharyngotympanic tube (Eustachian tube) connects the middle ear to the pharynx, so it's part of the middle ear, not external.

Answer:

A. pharyngotympanic tube