A. 1) incus and the malleus 2) stapes and the malleus 3)incus and the stapes B. 1) incus 2) malleus The five regions of the ear are the: semicircular canal, ampulla, saccule, utricle, and cochlea Of the these 5 regions, ________ sensory receptors that detect changes in head position and motions A) two contatin B) one contains C) three contain 4) four contain Thank you!! Bones at the back of the jaw shrink and detach from the jaw to become the A ndibula, a rod that joins the upper jaw to the skull, shrinks es the .