KNES 385 Lecture Notes - Lecture 20: Semicircular Canals, Endolymph, Vestibular System
18 Nov 2016
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Perception of self-motion (versus environmental motion: metro moves and not you, visual a(cid:374)d (cid:448)estbiuar syste(cid:373) do(cid:374)"t al(cid:449)ays (cid:449)ork together. Perception of head position: from muscle spindles in the neck for position of the head. Vestibular apparatus and cochlea are close and share a nerve: receptors can provide information about orientation of body relative to gravity. Afferent information is used to stabilize gaze (eyes in orbital cavity- can fixate on something), head, and posture. Cochlea is central for hearing- near the vestibular system. Next to that is the otolyphic organs- the utricle and the sacculus. The endolymph in the semicircular canals goes the opposite direction than the acceleration. Cucpula is the hair cells that are being displaced by the endolymph velocity, sos there is no bending of the hair cell because no acceleration. Rotation of the head at a steady velocity: the endolymph and canal move at the saem.
