The ears of vertebrates are placed somewhat symmetrically on either side of the head, an arrangement that aids sound localisation. The inner ear sits in the bony labyrinth, and contains structures which are key to several senses: the semicircular canals, which enable balance and eye tracking when moving the utricle and saccule, which enable balance when stationary and the cochlea, which enables hearing. The middle ear includes the tympanic cavity and the three ossicles. ![]() ![]() Since the outer ear is the only visible portion of the ear in most animals, the word "ear" often refers to the external part alone. The outer ear consists of the pinna and the ear canal. In mammals, the ear is usually described as having three parts-the outer ear, the middle ear and the inner ear. The ear is the organ that enables hearing and, in mammals, body balance using the vestibular system. How sounds make their way from the source to the human brain
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