8 How Sound Travels in the Middle Ear When sound waves reach the middle ear, they cause the eardrum to vibrate.This vibration then causes the three bones to vibrate.These vibrations are transformed into longitudinal/pressure waves in the middle ear.
9 The Inner EarTwo main parts:CochleaAuditory Nerve
14 The Auditory NerveThe tiny hair cells of the cochlea are set in motion by vibrationsThe vibrations stimulate tiny nerve cells.The nerve cells then send signals along the auditory nerve to the brain.
15 A sound is not actually heard until the brain receives and processes these signals.
17 D H E B A G C F Put the following steps in order: The stirrup moves back and forth, creating pressure waves in the cochlea.The bones of the middle ear (hammer, anvil, & stirrup) vibrate.Hair cells send an electrical impulse through the auditory nerve.The outer part of the ear (the pinna) "catches" the sound waves.Sound waves vibrate the eardrumThe brain receives an electrical impulse and interprets it as sound.Tiny hair cells in the cochlea move as the waves pass.The sound waves travel into the ear canal.DHEBAGCF