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Once sound enters the ear canal it impacts on the tympanic membrane (The ear drum) its here in the middle ear that sound sound pressure is converted in to mechanical energy. Attached to the tympanic membrane are 3 bones (the smallest in your body), the malleus, the incus and the stapes (or the hammer, anvil and stirrup), these bones are responsible for two things, they are able to regulate the amount of sound coming in to the ear by expanding and contracting the tympanic membrane to protect the ear (although theres around a 100ms delay). They're also responsible for transferring these vibrations to the cochlea in the inner ear through the oval window. Put simply, the cochlea is filled with a watery liquid known as perilymph which moves in relation to the vibrations coming through the oval window. The perilymph then stimulates the thousands of little hair cells (which are 'tuned' to recognise a particular frequency), which convert the energy once again from mechanical to electrochemical impulses before being passed to the auditory nerve and to the brain for further processing.
Sound enters your ear through vibrations, and are usually funnelled into you ear by the pinna which is the flap of skin at the top of your ear- the part that you can see. These vibrations then continue down the ear canal, and the ear drum vibrates (the ear drum is a thin layer of tissue) the vibrations having been made larger by the force of the ear drum vibrating, and the then the sound travels through the ossicles, into the liquid in the snail shell-shaped cochlea, and the-nerve generating hairs combined with the nerve cells of the cochlear nerve send impulses to the brain.
When you first hear a sound, it goes through your outer ear and then through your ear canal. It passes the anvil, stirrup and the hammer (I'm not sure if it goes through) and through the cochlea which goes to the nerves *gasp* which goes to your brain.
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