The Ear

Metaphorically speaking, the ear works like an information highway to the brain. Coming from the outside, sound waves cause the eardrum to vibrate. The fine auditory ossicles of the middle ear (hammer, anvil, stirrup) guide the impulse towards the cochlea.
At this point, Tomatis contradicted the doctrine used to date. In his view, the acoustic impulses go directly through the eardrum and into the bone surrounding the ear (petrous bone) to the cochlea. Here, the acoustic signals are transformed into neuronal impulses that are transmitted via the auditory nerve to the brain for processing.
Besides the cochlea, three bony semicircular canals (vestibules) are part of the inner ear. They are responsible for the sense of balance; they detect stimuli of position and acceleration; and they send this information over the nerve tract to the brain.