The direction of movement of the head relative to gravity is determined by
A) stereocilia in a gelatinous material called a cupula.
B) movement of fluid in the ampulla.
C) displacement of otoliths on the otolithic membrane.
D) asymmetric nerve impulses from proprioceptors on the left and right side of the head.
E) integration of the visual and auditory signals in the equilibria center of the cortex.

Question

Quizplus · Accepted Answer

The direction of movement of the head relative to gravity is determined by the displacement of otoliths on the otolithic membrane. This occurs in the utricle and saccule of the inner ear, where otoliths (tiny calcium carbonate crystals) move in response to changes in head position, affecting the hair cells beneath them and thus signaling head position relative to gravity.

The Direction of Movement of the Head Relative to Gravity