septum of pharyngotympanic (auditory) tube

sep·tum of pharyngotympanic (au·di·to·ry) tube

a thin horizontal plate of bone forming two semicanals, the upper, smaller, for the tensor tympani muscle, and the lower, larger for the pharyngotympanic (auditory) tube; its termination in the middle ear is the processus cochleariformis. Synonym(s): septum canalis musculotubarii, septum of musculotubal canal, septum tubae