EENT and Sleep Disorders Q 69 - Gyan Darpan : Learning Portal
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Tuesday 22 March 2022

EENT and Sleep Disorders Q 69

The ear bones that transmit vibrations to the oval window of the cochlea are found in the:
     A. Inner ear
     B. Outer ear
     C. Middle ear
     D. Eustachian tube

Correct Answer: C. Middle ear.

The bones in the middle ear transmit and amplify air pressure waves from the tympanic membrane to the oval window of the cochlea, which is the inner ear. The tympanic membrane separates the other from the middle ear. 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 A: The inner ear is a space composed of the bony labyrinth and the membranous labyrinth, one inside the other. The bony labyrinth has a cavity filled with semicircular canals that are in charge of sensing equilibrium; this cavity is called the vestibule and is the place where the vestibular part of the VIII cranial nerve forms.
Option B: The outer ear, also called auricle, is composed of cartilage and it is the part with the most contact with the external world. It has various anatomical demarcations like the helix, the antihelix, the tragus, and the antitragus and these demarcations lead to a depression called acoustic meatus.
Option D: The Eustachian tube plays a role in equalization, oxygenation, and drainage of the tympanic cavity in the middle ear. More specifically, the Eustachian tube permits equalization of pressure in the middle ear with respect to ambient pressure.

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