cloacal membrane

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.

Look at other dictionaries:

  • 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

  • Cloaca (embryology) — For other uses, see Cloaca. Cloaca (embryology) Tail end of human embryo thirty two to thirty three days old. Cloaca is visible at center left. The endodermal cloaca is labeled with green, while the ectodermal cloaca is seen as a colorless crest… …   Wikipedia

  • 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

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