Pain, Kinesthetic, and Vestibular Senses Answers

One reason is that non-painful touch signals can activate inhibitory interneurons in the spinal cord. These interneurons reduce the transmission of pain signals toward the brain, effectively closing the pain gate and lowering the perception of pain.

When the head rotates, the fluid (endolymph) in the semicircular canals initially lags behind the movement. This bends the cupula and the hair cells in the ampulla. Bending the hair-cell stereocilia toward the kinocilium depolarizes the cells and increases their signals, while bending them away hyperpolarizes the cells and decreases their signals. The vestibular nerve carries this information to vestibular nuclei in the brainstem and to the cerebellum, where it helps the brain coordinate balance, posture, and eye movements.

Kinesthesis is the sense of the position and movement of your body parts. Receptors in muscles, tendons, and joints send information about movement and body position to the brain. This sense is important because it helps you coordinate actions, maintain posture, and move accurately even when you cannot see your body. Kinesthesis is applied in many disciplines, including sports training and dance, physical therapy and rehabilitation, medicine, and robotics, where understanding or reproducing movement is important.