urorectal septum

(redirected from urorectal fold)

ur·o·rec·tal sep·tum

in embryos, a partition dividing the cloaca into a dorsal, rectal portion and a ventral portion called the urogenital sinus; reaching the cloacal membrane at about the time of its disintegration, the urorectal septum divides the cloacal exit into an anal and a urogenital orifice.
Synonym(s): urorectal fold
References in periodicals archive ?
Atresia ani is a congenital malformation of anorectum due to failure of urorectal fold to divide the cloaca completely or failure of perforation of fetal anal membranes that divides rectus and anus during fetal development, this condition is inherited in an autosomal recessive manner, but no candidate genes have been found unlike pigs (Albarella et al., 2017).