| entodermal cells | Embryonic cell's forming the yolk sac and giving rise to the epithelium of the alimentary and respiratory tracts and to the parenchyma of associated glands. Synonym: entodermal cells. (05 Mar 2000) |
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| persistent cloaca | A condition in which the urorectal fold has failed to divide the cloaca of the embryo into rectal and urogenital portions. Synonym: sinus urogenitalis, urogenital sinus. (05 Mar 2000) |
| cloaca | 1. <zoology> A common passage for faecal, urinary and reproductive discharge in most lower vertebrates. 2. <embryology> The terminal end of the hindgut before division into rectum, bladder and genital primordia. 3. <pathology> An opening in the involucrum of a necrosed bone. (18 Nov 1997) |
| ectodermal cloaca | The proctodeum of the embryo. (05 Mar 2000) |
| endodermal cloaca | Terminal portion of the hindgut internal to the cloacal membrane of the embryo. (05 Mar 2000) |
| exstrophy of the cloaca | A developmental anomaly in which an area of intestinal mucosa is interposed between two separate areas of the urinary bladder. Synonym: ectopia cloacae. (05 Mar 2000) |