How We Hear
The pinna collects sound waves which passes through the auditory canol and then hits the eardrum causing it to vibrate. This vibration is the picked up by the 3 small bones called the ossicles which makes the vibration much stronger. The ossicles consists of the hammer, anvil and stirrup When the ossicles vibrate, this passes to the oval window and then to cochlea of the inner ear. The cochela contains fluid and tiny hairs which are stimulated from the vibration , which then produces impulses in the auditory nerve. The auditory nerve sends a signal to the brain and it recognizes the sounds.