Which structure is located within the middle ear?
a. vestibule c. stapes
b. semicircular canals d. oval window
C
The tympanic membrane is the boundary between the outer ear and middle ear. The three bones (ossicles) of the middle ear are the malleus (hammer), incus (anvil), and stapes (stirrup). The malleus is attached to the tympanic membrane; the incus joins the malleus to the stapes, which rests on the oval window. The vibration created by sound waves passes through the outer ear canal to the tympanic membrane and then to these three bones. The eustachian tube opens into the pharynx from the middle ear to equalize pressure on both sides of the eardrum.
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