- cloacal membrane
- cloacal membrane n a plate of fused embryonic ectoderm and endoderm closing the fetal anus
* * *the thin, temporary barrier between the hindgut and the exterior, formed by the endoderm of the hindgut and the ectoderm of the cloaca of the embryo; its dorsal part forms the anal membrane.
Medical dictionary. 2011.
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Cloacal membrane — Tail end of human embryo from fifteen to eighteen days old. Latin membrana cloacalis Gray s … Wikipedia
cloacal membrane — noun anatomy : a plate of fused ectoderm and endoderm closing the fetal anus in the vertebrate embryo … Useful english dictionary
cloacal folds — slight elevations located just lateral to the cloacal membrane early in the fifth week of embryonic development, later dividing into urogenital folds and anal folds … Medical dictionary
membrane — 1. A thin sheet or layer of pliable tissue, serving as a covering or envelope of a part, as the lining of a cavity, as a partition or septum, or to connect two structures. SYN: membrana [TA]. 2. SYN: biomembrane. [L. membrana, a skin or m … Medical dictionary
anal membrane — the dorsal part of the cloacal membrane after its division by the urorectal septum … Medical dictionary
Development of the reproductive system — The development of the reproductive system is a part of prenatal development, and concerns the sex organs. It is a part of the stages of sexual differentiation. Because its location to a large extent overlaps the urinary system, the development… … Wikipedia
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plate — 1. [TA] In anatomy, a thin, relative flat, structure. SYN: lamina [TA]. 2. A metal bar perforated for screws applied to a fractured bone to maintain the ends in apposition. 3. The agar layer within a Petri dish or similar … Medical dictionary
Septum — A word borrowed from the Latin "saeptum" meaning a "dividing wall or enclosure." * * * 1. [TA] A thin wall dividing two cavities or masses of softer tissue. See septal area, transparent s.. 2. In fungi, a wall; usually a cross … Medical dictionary
Embryology — 1 morula, 2 blastula 1 blastula, 2 gastrula with blastopor … Wikipedia