What does the vestibular system provide information about?

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The vestibular system provides information about head motion and spatial orientation to help you balance and keep your gaze steady as you move. It sits in the inner ear and has two main parts: the semicircular canals detect angular head movements (rotations) in three dimensions, while the otolith organs (the utricle and saccule) detect linear acceleration and head position relative to gravity. The brain uses these signals to coordinate balance, posture, and eye movements through reflexes like the vestibulo-ocular reflex, which stabilizes images on the retina during head motion. This system lets you know where your head is in space and how it’s moving, so you can walk, turn, or tilt without losing balance or your place in the visual scene. By comparison, color and brightness are handled by vision, hormones by the endocrine system, and sound processing by the auditory system, so those functions aren’t what the vestibular system provides.