The vestibular system contributes to balance and orientation in space. It is the leading system informing us about movement and position of head relative to gravity. Our movements include two positions rotations and linear directionality. Thus, the vestibular system has two related components: the semicircular canal system, (related to detecting rotation) and the otoliths, (related to detecting linear acceleration/deceleration). The vestibular system sends signals primarily to the neural parts of the brain that control our eye movements, and that keep us upright. (SPD Star)