File:Development of the cloaca different species.png
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| Description | Figure 7. - Development of the cloaca. (A) Cloaca of a human embryo around fifth week, when the embryo is anatomically sexually indifferent. The urogenital sinus is positioned anteriorly (left), and the distal anus is positioned posteriorly (right); both systems initially drain into a common opening. Arising from the urogenital sinus is the allantois that enters the umbilical cord anteriorly as the primitive excretory system, and the mesonephric duct with the ureteric bud, (B) Cloacal derivatives in a female embryo. The structures from anterior to posterior include the bladder and ureter, vagina and uterus, and anorectal canal. The upper portion of vagina as well as the uterus and fallopian tubes are formed from the paramesonephric duct, and the upper portion of the anus above the pectinate line is formed from gut endoderm, (C) Cloaca of a male reptile, where the ureter, ductus deferens and distal intestines terminate in a common opening, (D) Cloaca of a male monotreme, where the ureter, ductus deferens, and distal intestines terminate in a common opening, but a deeper fold begins to incompletely separate the genitourinary tract from the gastrointestinal tract. Paramesonephric duct structures are shown in blue, mesonephric duct structures are shown in pink, gut endodermal structures are shown in yellow, and cloacal structures are shown in green. |
| Date | |
| Source | https://www.researchgate.net/publication/304253500 Embryology comparative_anatomy and_congenital malformations of the_gastrointestinal tract Embryology, comparative anatomy, and congenital malformations of the gastrointestinal tract. Edorium J Anat Embryo 2016;3:39–50. doi:10.5348/A04-2016-14-RA-6 |
| Author | Danowitz M, Solounias N. |
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© 2016 Melinda Danowitz et al. This article is distributed under the terms of Creative Commons Attribution License which permits unrestricted use, distribution and reproduction in any medium provided the original author(s) and original publisher are properly credited. Please see the copyright policy on the journal website for more information.
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| current | 23:51, 20 July 2024 | | 1,026 × 687 (361 KB) | Rasbak (talk | contribs) | {{Information |description= Figure 7. - Development of the cloaca. (A) Cloaca of a human embryo around fifth week, when the embryo is anatomically sexually indifferent. The urogenital sinus is positioned anteriorly (left), and the distal anus is positioned posteriorly (right); both systems initially drain into a common opening. Arising from the urogenital sinus is the allantois that enters the umbilical cord anteriorly as the primitive excretory system, and the mesonephric duct with the urete... |
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