Cloacal membrane
Tail end of human embryo from fifteen to eighteen days old.
Gray's	subject #6 47
Carnegie stage	7
Days	15
Precursor	caudal end of the primitive streak

The cloacal membrane is the membrane that covers the embryonic cloaca when still in the development of the urinary and reproductive organs.

It is formed by ectoderm and endoderm coming into contact with each other. After separation of the cloaca into the urogenital and anal parts, the cloacal membrane, in turn, is separated into a urogenital membrane and an anal membrane.

[edit] External links

• Swiss embryology (from UL, UB, and UF) hdisqueembry/triderm04
• genital-021 — Embryology at UNC
• Diagram at unsw.edu.au
• Overview at ana.ed.ac.uk

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.

v • d • e Prenatal development/mammalian embryogenesis - Development of the urinary and reproductive organs (GA 11.1204) Common Urinary/Reproductive system Cloacal membrane - Cloaca - Urethral groove - Urogenital sinus - Urachus - Urogenital folds Kidney development Nephrogenic cord - Nephrotome - Pronephros - Mesonephros (Mesonephric tubules) Ureteric bud - Metanephric blastema Fetal genital development Primarily internal Gonadal ridge - Sex cord (Cortical cords, Testis cords) Pronephric duct/Wolffian duct/mesonephric duct - Müllerian duct/paramesonephric ducts (Vaginal plate) Primarily external Genital tubercle - Phallus - Labioscrotal folds Gubernaculum - Processus vaginalis Homologues List of homologues of the human reproductive system urinary system navs: anat/physio/dev, noncongen/acid+base/congen/neoplasia, symptoms+signs/eponymous, proc reproductive system navs: anat female,male/physio/dev, noncongen/congen/neoplasia, symptoms+signs/eponymous, proc