HANS-ULRICH OSTERWALDER / SCIENCE PHOTO LIBRARY HANS-ULRICH OSTERWALDER / SCIENCE PHOTO LIBRARY
Organs of hearing. Artwork illustrating the hearing organs of the human ear. At left is the visible part of the ear, the pinna, which channels sound waves along the ear canal to the ear drum. The ear drum (blue, lower centre) transmits the sound to the bones of the inner ear (centre, pink). These 3 tiny joined bones consist of the malleus (hammer), the incus (anvil) and the stapes (stirrup). The cochlea (spiral, lower right), contains microscopic hairs that respond to sound vibrations from the middle ear. The loops (upper right) are semi-circular canals which are responsible for balance.
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