semicircular canal(redirected from Posterior semicircular duct)
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Related to Posterior semicircular duct: anterior semicircular canal
Any of three tubular and looped structures of the inner ear, together functioning in maintenance of the sense of balance in the body.
One of the three perpendicular tubular hollows, each forming two-thirds of a circle, that extend from the vestibule of the labyrinth in the inner ear. The semicircular canals are the bony shells that contain the similarly shaped semicircular ducts, membranous sensory organs that detect the angular acceleration and the orientation of the head.
See also: canal