3D CT image of the reuniting duct (RD), saccular duct (SD) and endolymphatic sinus (ES) of a healthy volunteer's ear (left), cadaver's ear (upper right), and schematic view (lower right). All these views are left ears. Red arrows show the RD and yellow arrows show the SD and ES. CR, cochlear recess; EnS, endolymphatic sac; IAC, internal auditory canal; L, lateral semicircular canal; OS, osseous spiral lamina; P, posterior semicircular canal; S, superior semicircular canal; SA saccule; SR, saccular recess; UR, utricular recess.