The semicircular canals are three fluid-filled structures located in the inner ear. They play a crucial role in maintaining balance and spatial orientation. Each canal is oriented in a different plane—horizontal, anterior, and posterior—allowing the body to detect rotational movements in various directions. Inside the canals, tiny hair cells respond to the movement of fluid when the head rotates. This movement sends signals to the brain, helping it understand the body's position and motion. Proper functioning of the semicircular canals is essential for activities like walking, running, and maintaining balance.