Question

Bony labyrinth is filled with a fluid called
(A) Endolymph
(B) Perilymph
(C) Hololymph
(D) Juxtalymph

Answer 1

Hint: The human ear is one of the sensory organs that is used to hear the sound and convey it to the brain. It is divided into three parts: outer ear, middle ear and the inner ear. Outer earth is located externally to protect the inner ear. Middle ear includes the path to the eardrum. And the inner ear contains the most sensitive part of the ear.

Complete Answer:
Inner ear is the part of the ear which contains the senses and equilibrium of the hearing. It is also known as labyrinth. This part of the ear is membranous and delicate structure in an irregular shape. The membranous labyrinth is covered by the bony labyrinth but these two parts are not attached fully. At some places, it is attached but most of the places remain unconnected and separated by the perilymphatic space.

This space contains some fluid which is similar to the cerebrospinal fluid but is watery in nature. This fluid is called perilymph. But inside the membranous delicate labyrinth there filled a fluid called endolymph. Hence bony labyrinth is filled with a fluid called endolymph.

Thus, the option (A) is correct.

Note: The perilymph and endolymph are separated by means of reissner membrane. The main function of these two fluids is to control the flow of chemicals from the blood to the inner ear. Endolymph has concentrations of high potassium and low sodium.