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Terms in this set (10)
one of the three fluid-filled tubes in the inner ear that are part of the vestibular system. each of the tubes, which are at right angles to each other, detects rotation of the head in a different plane.
small fluid-filled sac in the vestibular system above the saccule that responds to static positions of the head. where the three semicircular canals connect. detects straight-line acceleration/deceleration.
small fluid-filled sac under the utricle in the vestibular system that responds to static positions of the head. detects straight-line acceleration/deceleration.
enlarged region of each semicircular canal that contains the receptor cells (hair cells) of the vestibular system
small gelatinous column that forms part of the lateral-line system of aquatic animals and also occurs within the vestibular system of mammals. stereocilia are embedded in it in a specific orientation, which determines which head movements they are sensitive to.
small crystals on the gelatinous membrane above hair cells of saccules and utricles in the vestibular system; maximize the deflection of hair cells when the head tilts or during acceleration/deceleration
a sensory system, found in many kinds of fishes and some amphibians, that informs the animal of water motion in relation to the body surface using receptors along the sides of the body. speculation that the first semicircular canals developed from these external canals moving into the body.
brainstem nuclei that receive information from the vestibular organs through cranial nerve VIII (vestibulocochlear nerve)
brainstem mechanism that maintains gaze on a visual object despite movements of the head. requires precise control of eye movements based on vestibular inputs and not visual inputs (we know this because it works even when the eyes are closed)
sensory conflict theory
theory of motion sickness suggesting that discrepancies between vestibular information and visual information simulate food poisoning and therefore trigger nausea
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