The auditory organ is the EAR, which is composed of three parts: the outer EAR, the middle EAR, and the inner EAR. The outer EAR is responsible for collecting sound waves and directing them to the eardrum. The middle EAR contains three small bones that vibrate in response to the sound waves and transmit them to the inner EAR. The inner EAR contains the cochlea, which is filled with fluid and lined with tiny hairs that convert the vibrations into electrical signals that are sent to the brain.