The outer and middle ear exist primarily to conduct sound, which is first perceived when it hits the inner ear. The inner ear houses the snail-shaped cochlea, which is lined with hair cells, so called because of the tuftlike projections topping each one. When a sound wave arrives, the tufts move and vibrate, triggering an electrical response inside the cells that causes them to release neurotransmitters.
by Lisa M. Jarvis |
April 07, 2014