A common opening of the alimentary and reproductive systems of male nematodes, normally situated on the ventral side at the posterior end of the body.
n. the most posterior part of the embryonic *hindgut. It becomes divided into the rectum and the urinogenital sinus, which receives the bladder together with the urinary and genital ducts.
n. the back part of the embryonic gut, which gives rise to part of the large intestine, the rectum, bladder, and urinary ducts. See also cloaca.... hindgut
Health Encyclopedia