Otolithic membranes of the maculae sacculi and utriculi are important in sensing gravity and motion
The vestibular system of the inner ear has a fibrous tissue called the otolithic membrane. It is essential for how the brain interprets equilibrium. In addition to measuring the linear acceleration of the body, the membrane also determines whether the head or the body is tilted. The linear acceleration could occur vertically, like when an elevator moves up or down, or horizontally, like when an automobile is traveling.The vestibular system of the inner ear has a fibrous tissue called the otolithic membrane. It is essential for how the brain interprets equilibrium. In addition to measuring the body's linear acceleration, the membrane also detects tilts of the head or body. The linear acceleration could occur vertically, like when an elevator moves up or down, or horizontally, like when an automobile is traveling.Gravity causes the otolithic membrane to move away from the sensory epithelium when the head tilts (macula). The hair bundles, which are embedded in the bottom, gelatinous surface of the membrane, are moved as a result of the shearing motion between the otolithic membrane and the macula. The displacement of the hair bundles causes the hair cells to produce a receptor potential. The otolithic membrane assists the body in detecting linear accelerations in addition to tilting.
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