Three fluid-filled bony canals which make up part of the vestibular system located within the inner ear. They are lined with hair cells and filled with fluid called endolymph. The three canals are called the horizontal, superior, and posterior semicircular canals. When the head moves, the fluid moves within these canals and stimulates the hair cells. These movements are communicated to the brain to help maintain balance during head movement. These three canals are each responsible for sensing movement in a different direction. A loss of balance can occur if any three of these canals’ function is diminished.
Everyday Hearing > Semicircular Canals