The External Auditory Canal leads from the Pinna to the Tympannic Membrane. It is about 2.5cm long and is a slightly S shaped canal. Special glands can pump wax into the canal to trap specks of dust or insects, and a few hairs are present. The malleus is firmly attached to the ear drum and the stapes is connected to the oval window of the inner ear. The incus is the connector between the malleus and the stapes.
Sound waves make the ear drum vibrate.
The three bones of the middle ear by vibrating themselves. The Eustachian tube is an air passage from the back of the nose and throat to the middle ear, ensuring that air pressure is maintained. The oval window separates the middle ear from the inner ear. These tiny nerve endings lead to the auditory nerve which carries the sound messages to the brain. Also in the inner ear are the semi-circular canals.