Question about the frequency of sound..?

Question

The frequency of sound is indicated to the nervous system by the..

A) Frequency of vibration of the tectorial membrane

B) The frequency of stereocilia vibration.

C) Region of the inner ear that is stimulated.

D) Movement of the perilymph in the cochlear duct.

E) Number of rows of hair cells that are stimulated.

Answer 1

Its A

Covering the sulcus spiralis internus and the spiral organ of Corti is the tectorial membrane, which is attached to the limbus laminae spiralis close to the inner edge of the vestibular membrane. The tectorial membrane partially covers the hair cells in Organ of Corti and vibrate when fluid sound waves hit it.

American anatomist Irving Hardesty (1866-1944) considered the tectorial membrane as the vibrating mechanism in the cochlea. A structure known as Hardesty's membrane divides the subtectorial space into two compartments, one facing the surfaces of inner hair cells and one facing the surfaces of outer hair cells.