True about anal membrane
Before the urorectal septum has an oppounity to fuse with the cloacal membrane, the membrane ruptures, exposing the urogenital sinus and dorsal anorectal canal to the exterior. Later on, an ectodermal plug, the anal membrane, forms to create the lower third of the rectum. ref - Semantischolar.org ref - BDC vol2
Perforates at 6 weeks
Develops from anterior pa of cloacal membrance
Lies at proximal pa of proctodaeum
Covers urogenital sins
Abdomen and pelvis