The membrane that covers the embryonic cloaca, formed by the union of proctodeal (anal pit) ectoderm and cloacal endoderm, with no intervening mesoderm; the urorectal septum joins the cloacal membrane and divides it into an anal membrane and a urogenital membrane; the point where the urorectal septum intersects the cloacal membrane is the future site of the perineal body; proliferation of mesoderm and ectoderm around the cloacal membrane produces primordial tissues of the external genitalia in both sexes: the genital tubercle, genital folds, and genital swellings. [ MP:anna Wikipedia:Cloacal_membrane MP:0011837 ]
术语信息
- FMA:295525
- UMLS:C0231056 (ncithesaurus:Cloacal_Membrane)
- SCTID:308826008
- EHDAA:214
- EHDAA2:0000257
- EMAPA:16832
- VHOG:0001198
- NCIT:C34128
- Wikipedia:Cloacal_membrane
- EHDAA:2933
pheno_slim, emapa_ehdaa2
A membrane that separates the proctodeum and the hindgut in the early embryo. [Evolution, Fourth_Edition_(2006)_McGraw-Hill, Function, Vertebrates:_Comparative_Anatomy, p.497, see_Kardong_KV][VHOG]
In mammals, the cloaca exists as an embryonic structure that undergoes septation to become distinct urethral, anal, and genital orifices.[well established][VHOG]
The membrane that covers the embryonic cloaca, formed by the union of proctodeal (anal pit) ectoderm and cloacal endoderm, with no intervening mesoderm; the urorectal septum joins the cloacal membrane and divides it into an anal membrane and a urogenital membrane; the point where the urorectal septum intersects the cloacal membrane is the future site of the perineal body; proliferation of mesoderm and ectoderm around the cloacal membrane produces primordial tissues of the external genitalia in both sexes: the genital tubercle, genital folds, and genital swellings.