Fig. 1. A schematic diagram of the chicken inner ear from E3 to E7. Dotted lines represent the plane of a cross section through the vertical canals, shown above each stage. asc, anterior semicircular canal; cc, common crus; cd, cochlear duct; ed, endolymphatic duct; fp, fusion plate; psc, posterior semicircular canal; rd, resorption domain; vp, vertical canal pouch; A, anterior; D, dorsal.