They are found in the ampullae of each of the semicircular canals of the inner ear, meaning that there are three pairs in total.

The function of the crista ampullaris is to sense angular acceleration and deceleration.

The inner ear comprises three specialized regions of the membranous labyrinth: the vestibular sacs – the utricle and saccule, and the semicircular canals, which are the vestibular organs, as well as the cochlear duct, which is involved in the special sense of hearing.

Covering the crista ampullaris is a gelatinous mass called the cupula.

Upon angular acceleration (rotation), the endolymph within the semicircular duct deflects the cupula against the hair cells of the crista ampullaris.