HOW DO WE TRANSFORM SOUND WAVES INTO NERVE IMPULSES THAT OUR BRAIN INTERPRETS?
Outer ear recieves sound waves through the auditory canal to the eardrum. The bones of the middle ear (hammer,anvil, stirrup) amplifies and relay the vibrations through the cochlea's membrane (the oval window). The cochlea, fluid filled, snail-shaped tube located in the inner ear. Pressure changes in the ear results in rippling of the basilar membrane, bending hair cells. This triggers impulses to the auditory nerve then to the thalamus and on to the auditory cortex.