The spherical chamber at the top of the inner ear is called utriculus. It consists of 3 semicircular canals. 2 vertical ducts and 1 horizontal duct. The ducts are located at right angles to each other. One end of each duct swells to form an ampulla.
The ampulla contains the sensory cells or macula. Sensory cells give rise to sensory hair cells. Sensory hair cells are embedded in otolith grains (stones). Otolith granules are covered by cupula. Utriculus maintains body balance.