2 (b) The Hearing System

Hearing is one of the ways that we perceive our environment.  Our ear is the main part of the hearing system. Our ear contains 3 parts. The external ear, middle ear and the inner ear.  The external ear contains the pina and the external auditory canal and it is the visual part of our ear. The pina and the external auditory canal capture sound waves. It goes though the ear canal this causes the  tympanic membrane ( eardrum) to vibrate. This causes 3 bones the hammer, anvil and stirrup to vibrate. These vibration leads to the cochlea. Cochlea is a fluid filled structure and it is tuned to certain frequency. The cochlea features 2 different liquids ( Endolymph and Perilymph)  hat are both tuned to different frequencies.