Cloacal membrane

Cloacal membrane
Cloacal membrane
Gray991.png
Tail end of human embryo from fifteen to eighteen days old.
Latin membrana cloacalis
Gray's subject #6 47
Carnegie stage 7
Days 15
Precursor caudal end of the primitive streak
Code TE E5.4.0.0.0.0.15

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.[1] 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.

It has been suggested that developmental errors may be associated with enlarged clitorises.[2]

References

  1. ^ "Endoderm -- Developmental Biology -- NCBI Bookshelf". http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=dbio&part=A3745. 
  2. ^ van der Putte SC (November 2009). "Penislike clitorises with megalourethras in nonvirilized female fetuses and a newborn. A histopathologic study and its bearing on their pathogenesis". J. Pediatr. Surg. 44 (11): 2223–9. doi:10.1016/j.jpedsurg.2009.07.024. PMID 19944238. http://linkinghub.elsevier.com/retrieve/pii/S0022-3468(09)00582-X. 

External links

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 As such, some of the information contained within it may be outdated.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 · ePrenatal development/mammalian embryogenesis · Development of the urinary and reproductive organs (GA 11.1204, TE E5.6-7)
Common urinary and
reproductive system
Urinary system
development
Reproductive system
development
Primarily internal
Primarily external

LPM → Genital tubercle → Labioscrotal swelling → Scrotum or Labia majora

LPM → Genital tubercle → Primordial phallus → Penis or Clitoris

IM → Gubernaculum

Peritoneum → Processus vaginalis or Canal of Nuck
Homologues

M: URI

anat/phys/devp/cell

noco/acba/cong/tumr, sysi/epon, urte

proc/itvp, drug (G4B), blte, urte

M: ♀ FRS

anat/phys/devp

noco/cong/npls, sysi/epon

proc/asst, drug (G1/G2B/G3CD)

M: ♂ MRS

anat/phys/devp

noco/cong/tumr, sysi/epon

proc, drug (G3B/4BE/4C)
v · d · ePrenatal development/Mammalian development of digestive system, coelom and septa, and mesenchymal mesenteric masses (GA 11.1101, TE E5.4, 5.8-9)
Gut
Upper GI tract and accessory
Abdominopelvic
Other
Intra-embryonic coelom · Extra-embryonic coelom

M: DIG

anat(t, g, p)/phys/devp/enzy

noco/cong/tumr, sysi/epon

proc, drug(A2A/2B/3/4/5/6/7/14/16), blte

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Look at other dictionaries:

  • 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… …   Medical dictionary

  • 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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