The small, bony structure in the ear that helps with balance is called the vestibule. The vestibule is part of the inner ear, positioned between the cochlea and the semicircular canals. It contains sensory structures, including the saccule and utricle, which detect linear accelerations and the position of the head relative to gravity. These structures play a crucial role in maintaining balance and spatial orientation. Information from the vestibule is transmitted to the brain, helping the body make adjustments to posture and movement in response to changes in balance, contributing to overall equilibrium.