The outer part of the ear collects sound. Sound travels through the auricle and the auditory canal, a short tube that ends at the eardrum. Sounds entering the outer ear travels through middle ear ( malleus, incus, stapes) and cause the eardrum and ossicles in the middle ear to vibrate. As it travels, it become louder and change from air to liquid. When the stapes moves, it pushes the oval window, which then moves the cochlea. The cochlea takes the fluid vibration of sounds from the surrounding semicircular ducts, translate them into signals sent to the brain by nerves like the vestibular nerve and cochlear nerve. The brain translates the information into recognizable sound patterns. It is a complex process but it occurs in a split - second of time.
Ear consists of three portions such as external ear, middle ear & inner ear

External ear: it consists of pinna & auditory meatus. Pinna or ear lobes collect sound waves from all directions.

Middle ear: consists of tympanum, ear ossicles and eustachian tube. Tympanum is thin membrane. The ear ossicles include chain of small bones as malleus,incus and stapes. The ear ossicles transmit the vibration from the tympanum to inner ear.

Inner ear: consists of semicircular canals and cochlea. Cochlea contains the organ of hearing called organ of corti. The sensory cells of the organ of corti are innervated by auditory nerve
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