macula sacculi
Quick Summary
The macula sacculi, also known as the saccular macula, is a sensory organ within the vestibule of the inner ear. It functions as a gravity receptor, responding to linear acceleration and changes in head position relative to gravity.12
The saccular macula is situated in a vertical plane and likely detects forward and backward tilts of the head. It is stimulated by shearing forces between the otolithic membrane and the underlying hair cells. This membrane is covered with calcite crystals (otoconia) that add weight, increasing the shearing forces when the head tilts. The arrangement of hair cells allows for the detection of head positions. While its exact role is still being researched, some scientists suggest it may also be sensitive to vibration.12
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