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

Answers (1)

Ans. The structure of human ear is divided into three parts- the external ear, middle ear and internal ear.

Structure of Middle Ear: The middle ear is composed of three bones or ossicles- malleus, incus, and stapes. All of three bones are attached to each other in a chain-like manner. Malleus is attached to tympanic membrane and stapes is attached to a membrane of cochlea called the oval window. The tympanic membrane is the one that separates the middle ear from external one. It is also called the ear drum. Not only that, it also helps in catching the sound waves and transmitting them to the bony ossicles. From the bony ossicles, the waves are transferred to the inner ear. The eustachian tube connects the pharynx to the middle ear. tympanic membrane and bony ossicles. Tympanic membrane separates middle ear from external ear and the middle ear is connected to pharynx by eustachian tube.

 

Structure of Inner Ear: Inner ear is composed of a fluid filled chamber called labyrinth. It is divided into two parts- an outer bony labyrinth and an inner membranous labyrinth. The bony labyrinth consists of channels which is filled with a fluid called endolymph. The portion which is coiled in the labyrinth is the cochlea. Cochlea consists of two large ear canals- upper vestibular canal and lower vestibular canal. The two canals are separated by a cochlear duct. Semi-circular canals help in maintaining balance and posture of the body and cochlea helps in sending audio signals to the brain.

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