The processus vaginalis (or vaginal process) is an embryonic developmental outpouching of the peritoneum. It is present from around the 12th week of gestation, and commences as a peritoneal outpouching.
processus vaginalis meaning:[Medicine] n : a pouch of peritoneum that is carried into the scrotum by the descent of the testicle and which in the scrotum forms the tunica vaginalis