The outer ear that is visible to us is called pinna.The pinna collects the sound waves and directs them to the ear tube .At the end of the ear tube is the ear drum. The eardrum vibrates when sound wave strike it and transmit the sound to the middle air .The three bones which are placed in the middle ear move when ear drum vibrates therefore transmit the vibration to the inner ear .The inner ear is connected to the middle ear through a small opening. The inner ear is filled with a fluid. When this fluid vibrates, this results in the transformation of vibrations into electrical impulses,