A gymnast is able to balance his body upside down even in the total darkness because of :
A gymnast is able to balance his body upside down even in the total darkness because of vestibular apparatus. Sensory information about motion, equilibrium, and spatial orientation is provided by the vestibular apparatus, which in each ear includes the utricle, saccule, and three semicircular canals. The utricle and saccule detect gravity (information in a vertical orientation) and linear movement.