The three parts of the ear are involved in the hearing process. Each part plays an integral role in directing the complex acoustic signals to the brain.
Hearing begins when the outer ear collects the sound and directs it down the ear canal to the eardrum.The eardrum vibrates causing the three bones in the middle ear to move back and forth. The motion of the bones causes the fluid in the inner ear or cochlea to move.
The inner ear contains a fluid-filled cochlea that is lined with thousands of tiny hair cells. As the fluid moves in waves along the cochlea stimulate the hair cells. The action causes nerve impulses to travel up the auditory nerve to the brain to be interpreted as sound.