Question

Scala vestibuli is connected with
A. Fenestra rotundus
B. Fenestra ovalis
C. Scala media
D. Eustachian tube

Answer 1

The vestibular duct or scala vestibuli is a perilymph-filled pit inside the cochlea of the internal ear that transfer sound and vibrations to the cochlear channel. It is isolated from the cochlear pipe by Reissner's layer and stretches out from the vestibule of the ear to the helicotrema where it joins the tympanic channel.

Complete answer:
Fenestra ovalis is known as the oval window. It is a little and oval layer that covers the kick off of the tympanic cavity of the central ear into the vestibule of the inward ear. It is associated with base of stapes through which it sends vibrations to cochlea when ear ossicles vibrate. The Oval window opens to scala vestibuli which is one of the liquid filled sacs in the internal ear.
The oval window is the convergence of the middle ear with the internal ear and is straightforwardly reached by the stapes; when vibrations arrive at the oval window, they have been enhanced more than 10 times from what they were at the point at which they reached the tympanic layer. It is a reinform (kidney-formed) opening driving into the vestibule of the internal ear from the tympanic cavity.

So, The correct option is (B) Fenestra ovalis.

Note: A bony spiral lamina, twists around the modulus like the string of a screw. It projects most of the way over the cochlear trench, halfway partitioning it into two compartments, an upper chamber called the scala vestibuli (vestibular slope) and a lower chamber called the scala tympani (tympanic incline). The scala vestibuli and scala tympani, which are loaded up with perilymph, communicate with one another through an opening at the peak of the cochlea, called the helicotrema. At its basal end, close to the centre ear, the scala vestibuli opens into the vestibule.