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==Human Mesonephric duct position (week 6 to 11)==
Schematic representations of the descent of the mesonephric duct (Wolffian duct, WD) or vas deferens. Anterior view.


Schematic representations of the descent of the Wolffian duct (WD) or vas deferens. Anterior view. At 6 weeks (A), the WD (red) opens to the urogenital sinus at a site adjacent to the ureteral orifice (UR; green). At 7–8 weeks (B, C), rather than descent, there are individual variations in the WD position along the mediolateral axis as well as in left/right difference in morphology of the urogenital sinus (URS). The future bladder and urethra are not discriminated in the sinus. At 8–9 weeks, the bilateral upper angles (arrows) of the URS start upward growth toward the umbilicus. At 9 weeks (D), depending on development of smooth muscles in the bladder as well as rhapdosphincter muscles of the urethra (RS), the descent of the vas deferens becomes evident. However, the epithelium is still same (arrowheads) between the future bladder and urethra. At 10–11 weeks (E), a drastic upward growth of bladder smooth muscles as well as a developing prostate (PR) accelerates the descent of the vas.
At 6 weeks (A), the WD opens to the urogenital sinus at a site adjacent to the ureteral orifice (UR).  
 
At 7–8 weeks (B, C), rather than descent, there are individual variations in the WD position along the mediolateral axis as well as in left/right difference in morphology of the urogenital sinus (URS). The future bladder and urethra are not discriminated in the sinus.  
 
At 8–9 weeks, the bilateral upper angles (arrows) of the URS start upward growth toward the umbilicus.  
 
At 9 weeks (D), depending on development of smooth muscles in the bladder as well as rhapdosphincter muscles of the urethra (RS), the descent of the vas deferens becomes evident. However, the epithelium is still same (arrowheads) between the future bladder and urethra.  
 
At 10–11 weeks (E), a drastic upward growth of bladder smooth muscles as well as a developing prostate (PR) accelerates the descent of the vas.




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:Links: [[Urinary Bladder Development]]
:Links: [[Urinary Bladder Development]]
===Reference===
===Reference===
<pubmed>28127497 </pubmed>
<pubmed>28127497</pubmed>





Latest revision as of 17:19, 9 March 2017

Human Mesonephric duct position (week 6 to 11)

Schematic representations of the descent of the mesonephric duct (Wolffian duct, WD) or vas deferens. Anterior view.

At 6 weeks (A), the WD opens to the urogenital sinus at a site adjacent to the ureteral orifice (UR).

At 7–8 weeks (B, C), rather than descent, there are individual variations in the WD position along the mediolateral axis as well as in left/right difference in morphology of the urogenital sinus (URS). The future bladder and urethra are not discriminated in the sinus.

At 8–9 weeks, the bilateral upper angles (arrows) of the URS start upward growth toward the umbilicus.

At 9 weeks (D), depending on development of smooth muscles in the bladder as well as rhapdosphincter muscles of the urethra (RS), the descent of the vas deferens becomes evident. However, the epithelium is still same (arrowheads) between the future bladder and urethra.

At 10–11 weeks (E), a drastic upward growth of bladder smooth muscles as well as a developing prostate (PR) accelerates the descent of the vas.


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General: 1901 Urinogenital Tract | 1902 The Uro-Genital System | 1904 Ovary and Testis | 1912 Urinogenital Organ Development | 1914 External Genitalia | 1921 Urogenital Development | 1921 External Genital | 1942 Sex Cords | 1953 Germ Cells | Historic Embryology Papers | Historic Disclaimer
Female: 1904 Ovary and Testis | 1904 Hymen | 1912 Urinogenital Organ Development | 1914 External Genitalia | 1914 Female | 1921 External Genital | 1927 Female Foetus 15 cm | 1927 Vagina | 1932 Postnatal Ovary
Male: 1887-88 Testis | 1904 Ovary and Testis | 1904 Leydig Cells | 1906 Testis vascular | 1909 Prostate | 1912 Prostate | 1914 External Genitalia | 1915 Cowper’s and Bartholin’s Glands | 1920 Wolffian tubules | 1935 Prepuce | 1935 Wolffian Duct | 1942 Sex Cords | 1943 Testes Descent | Historic Embryology Papers | Historic Disclaimer


Links: Urinary Bladder Development

Reference

<pubmed>28127497</pubmed>


https://acbjournal.org/DOIx.php?id=10.5115/acb.2016.49.4.231


Copyright

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Fig. 9. Acb-49-231-g009-l.jpg


Cite this page: Hill, M.A. (2024, March 28) Embryology Mesonephric duct position week 6-11.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Mesonephric_duct_position_week_6-11.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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current17:10, 9 March 2017Thumbnail for version as of 17:10, 9 March 2017697 × 800 (72 KB)Z8600021 (talk | contribs)Fig. 9 Schematic representations of the descent of the Wolffian duct (WD) or vas deferens. Anterior view. At 6 weeks (A), the WD (red) opens to the urogenital sinus at a site adjacent to the ureteral orifice (UR; green). At 7–8 weeks (B, C), rather...

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