What do the utricle and saccule sense?

What do the utricle and saccule sense?

• A. Head movement
• B. Sound intensity
• C. Temperature
• D. Head position

Answer: (D)

The utricle and saccule tell you where your head is in space by sensing gravity and linear motion. They contain hair cells in maculae that are embedded in a gelatinous layer with calcium carbonate crystals (otoliths) on top. When you tilt your head or experience linear acceleration, the otoliths drag the gelatinous layer, bending the hair cells and signaling to the brain about orientation and straight-line movement. The utricle mainly detects horizontal movements and head tilts, while the saccule detects vertical movements. This information helps you maintain balance and posture. They aren’t involved in hearing (that’s the cochlea) or temperature sensation, and angular head rotation is primarily detected by the semicircular canals, not these otolith organs. So the best answer is that they sense head position.

The utricle and saccule tell you where your head is in space by sensing gravity and linear motion. They contain hair cells in maculae that are embedded in a gelatinous layer with calcium carbonate crystals (otoliths) on top. When you tilt your head or experience linear acceleration, the otoliths drag the gelatinous layer, bending the hair cells and signaling to the brain about orientation and straight-line movement. The utricle mainly detects horizontal movements and head tilts, while the saccule detects vertical movements. This information helps you maintain balance and posture. They aren’t involved in hearing (that’s the cochlea) or temperature sensation, and angular head rotation is primarily detected by the semicircular canals, not these otolith organs. So the best answer is that they sense head position.