Explain the structure of the middle and internal

Question:

 Explain the structure of the middle and internal ear with the help of a diagram.

Solution:

The middle ear contains three ossicles which are arranged in a chain fashion called the malleus, incus and stapes

The malleus is attached to the tympanic membrane and the stapes is attached to the oval window of the cochlea. A Eustachian tube connects the middle ear cavity

with the pharynx and helps in equalizing the pressures on either side of the eardrum.

The inner ear is also called labyrinth which is fluid-filled and has two parts, the bony and the membranous labyrinth. Former is the series of channels inside this

membranous labyrinth is present and surrounded by a fluid called perilymph. The membranous labyrinth is filled with a fluid called endolymph. The coiled portion of the

labyrinth is called the cochlea. Endolymph is filled in scala media. At the base of the cochlea, the scala vestibule ends at the oval window, while the scala tympani

terminate at the round window which opens to the middle ear.

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