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From Embryology

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Primitive Kidney and Bladder

From a reconstruction (After Schreiner.)

The Urinary Bladder

  • bladder is formed partly from the entodermal cloaca and partly from the ends of the Wolffian (mesonephric) ducts
  • allantois takes no share in its formation
  • after the separation of the rectum from the dorsal part of the cloaca the ventral part becomes subdivided into three portions
  1. an anterior vesico-urethral portion, continuous with the allantois - into this portion the Wolffian ducts open
  2. an intermediate narrow channel, the pelvic portion
  3. a posterior phallic portion, closed externally by the urogenital membrane
  • the second and third parts together constitute the urogenital sinus
  • the vesico-urethral portion absorbs the ends of the Wolffian (mesonephric) ducts and the associated ends of the renal diverticula
  • these give rise to the trigone of the bladder and part of the prostatic urethra
  • the remainder of the vesico-urethral portion forms the body of the bladder and part of the prostatic urethra
    • its apex is prolonged to the umbilicus as a narrow canal
    • later is obliterated and becomes the medial umbilical ligament (urachus)

(text modified from Gray's Anatomy)



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Reference

Gray H. Anatomy of the human body. (1918) Philadelphia: Lea & Febiger.


Cite this page: Hill, M.A. (2024, June 21) Embryology Gray1118.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray1118.jpg

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File history

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current08:21, 28 May 2011Thumbnail for version as of 08:21, 28 May 2011600 × 403 (45 KB)S8600021 (talk | contribs)==Primitive Kidney and Bladder== from a reconstruction (After Schreiner.) {{Historic Disclaimer}} ===The Urinary Bladder=== * bladder is formed partly from the entodermal cloaca and partly from the ends of the Wolffian ducts * allantois takes no share