The Vestibular System - Throwing Cold Water on The Vestibular System
4 important questions on The Vestibular System - Throwing Cold Water on The Vestibular System
EN-USWhat
happens with the firing rate of both vestibular nerves when the head is
rotating to the left?
EN-USThe left
vestibular nerve increases his firing rate and the firing rate of the right
vestibular nerve decreases.
EN-USWhat
causes the ‘countermovement’ of the eyes when the head is turning?
EN-USBoth
vestibular nerves firing at a different rate. This difference causes movement
of the eyes counter to the turning motion. It causes a rapid eye movement (saccade) in the direction the head is
turning and a slow movement of the eye (nystagmus)
in opposite direction.
EN-USWhat
happens to the eyes if you put cold water in the vestibular system?
EN-USThe cold
water causes a decrease in firing rate of the vestibular nerve. This causes the
eyes to counter the movement by nystagmus and a fast movement component of the
eyes in the direction which the head is turning.
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What ocular reflexes are present and absent in unconscious patients?
EN-USSlow eye
movements are still present but the fast ones not anymore.
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