The ear bone name the ___1___ strikes the 2___(oval or round) window, setting up waves in the ___3__ (endolymph or perilymph). This pushes on the floor of the upper (scala vestibuli or scala tympani). As a result the cochlear duct is moved, and so is the perilymph in the lower canal, the (scala vestibuli or scala tympani). The pressure of the perilymph is finally expended by bulging out the 6___ (oval or round) window.