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The Inner Ear: Understanding the Balance System

Outline of man playing tennis showing brain, eyes, and joints. Brain interprets signals relayed from nerves throughout body. Eye sends visual data. Joints and muscles signal body position. Closeup of inner ear showing nerves, semicircular canals, and inner ear. Inner ear sends signals related to sound and body position.

Balance is a group effort of your eyes, inner ear, joints, and muscles. They each send signals to the brain about body position and head movement. The brain uses this information to balance the body. When you have an inner ear problem, the brain may get conflicting signals. This can cause symptoms such as the feeling of spinning (vertigo).

The inner ear sends signals

Inside the inner ear are 3 semicircular canals. Each canal contains tiny hairs, crystals, and fluid. These structures help the canals sense up-and-down, forward and backward, and side-to-side motion. Nerves carry the signals from the canals to the brain.

The brain interprets signals

Signals from throughout your body travel to the brain. Once the signals arrive, the brain decides what they mean. Sometimes signals conflict. Have you ever sat on a stopped train and watched a moving train go by? When that happens, your eyes signal that you're moving. But your inner ear and body signal that you're still. The brain weighs conflicting data such as this and decides what is true. The result is balance.

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