The part of the ear that contains the receptors for hearing is the:
A. Utricle
B. Cochlea
C. Middle ear
D. Tympanic cavity
Correct Answer: B. Cochlea.
The dendrites of the cochlear nerve terminate on the hair cells of the organ of Corti in the cochlea. The cochlea is the organ of hearing. It takes its name from the Greek language that means the shell of a snail and is the part from where the cochlear part of the VIII cranial nerve forms, thus constituting the vestibulocochlear nerve.
Option A: The utricle is a small membranous sac (part of the membranous labyrinth) and paired with the saccule lies within the vestibule of the inner ear. It has an important role in orientation and static balance, particularly in horizontal tilt.
Option C: The middle ear is an air-filled space. It divides into an upper and a lower chamber, the epitympanic chamber (attic) and the tympanic chamber (atrium), respectively. It is like a room because it has a rectangular-like shape.
Option D: The tympanic cavity is an air-filled compartment surrounded by bone that is separated from the external ear by a thin tympanic membrane (tympanum) and is in direct communication with the pharynx via the auditory tube (also known as the eustachian or pharyngotympanic tube).
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