Detailed anatomy of key ExG structures in adult mouse. Numbers indicate section number from distal tip. A, MUMP, cartilage (C), process (P) and bone (B) in adult wt male ExG. B, bifid (blue area), ventrally cleft (green area) distal prepuce, ventrally tethered clitoris (C), bone, preputial duct (P) and urethra (U) in adult wt female ExG. C, ventrally tethered clitoris containing bone and cartilage in adult αERKO female ExG. D, bifid distal portion and clitoris with bone but no cartilage in adult Tfm male ExG.