Otolith organ is defined as...

• A. A component of the optical system.
• B. A pressure sensor at the cockpit.
• C. An inner ear organ that detects linear acceleration and gravity orientation.
• D. A kidney function indicator

Answer: (C)

The otolith organ is part of the vestibular system in the inner ear. It includes two structures, the utricle and the saccule, each with hair cells covered by a gelatinous layer embedded with small calcium carbonate crystals called otoliths. When the head tilts or experiences linear acceleration, the otoliths shift the gelatinous membrane, bending the hair cells and sending signals to the brain about the direction of gravity and the rate of linear motion. This helps you sense orientation and linear movement, which is essential for balance and for maintaining correct flight attitude when visual cues aren’t clear. It is not an optical component, not a cockpit pressure sensor, and not related to kidney function.