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Urogenital Development

Urogenital Development. Table of Contents: . I. Primitive Kidney II. Internal Genitalia III. Definitive Kidney IV. External Genitalia. http://www.visembryo.com/baby/index.html.

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Urogenital Development

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  1. Urogenital Development Table of Contents: I. Primitive Kidney II. Internal Genitalia III. Definitive Kidney IV. External Genitalia http://www.visembryo.com/baby/index.html

  2. Both the urinary and genital components of the urogenital system are derived, to a large extent, from the intermediate mesoderm. Species: Mouse Day Gestation: 8 Approx. Human Age: 22 days View: Transverse Cut http://www.visembryo.com/baby/index.html

  3. The intermediate mesoderm becomes segmented into units termed nephrotomes. The lateral portions of the nephrotomes unite, forming a longitudinal duct on each side of the embryo http://www.visembryo.com/baby/index.html

  4. The lumen of each nephrotome opens into the mesonephric duct as well as into the body cavity. Glomeruli form as small vessels extend from the dorsal aortae. Human Age: 27 days http://www.visembryo.com/baby/index.html

  5. Removal of the lateral body wall Species: Mouse Day Gestation: 9 Approx. Human Age: 28 days View: Lateral http://www.visembryo.com/baby/index.html

  6. . . . illustrates the mesonephric duct extending toward the cloacal region and the openings of the nephric tubules into the body cavity. Species: Mouse Day Gestation: 9 Approx. Human Age: 28 days http://www.visembryo.com/baby/index.html

  7. As development progresses, the nephrogenic tissues forms urogenital ridges on the dorsal wall of the body cavity. The boxed area at higher magnification . . . Species: Mouse Day Gestation: 10-11 Approx. Human Age: 5-6 weeks View: Transverse Cut http://www.visembryo.com/baby/index.html

  8. . . . illustrates the mesonephric duct, the nephrotome, and the mesoderm covering the urogenital ridge. Species: Mouse Day Gestation: 10 Approx. Human Age: 5 weeks View: Transverse Cut http://www.visembryo.com/baby/index.html

  9. The urogenital ridge consists of the mesonephros and the gonad.

  10. The mesonephros consists of excretory tubules that contact a blood vessel medially and enter the mesonephric (Wolffian) duct laterally. At higher magnification . . . http://www.visembryo.com/baby/index.html

  11. . . . the relationships of the glomerular vessel, the duct and mesonephric tissue are seen. http://www.visembryo.com/baby/index.html

  12. The gonads develop as primordial germ cells that form in the wall of the yolk sac close to the allantois migrate along the dorsal mesentery of the hindgut to invade the genital ridges. http://www.visembryo.com/baby/index.html

  13. The path of germ cell migration within the dorsal mesentery is shown on this micrograph. Species: Mouse Day Gestation: 11 Approx. Human Age: 6 weeks View: Transverse Cut http://www.visembryo.com/baby/index.html

  14. The primordial germ cells become surrounded by cells of the primitive sex cords. At this stage the gonad is "indifferent," as one cannot morphologically distinguish between the male and female.

  15. links http://www.visembryo.com/baby/hp.html http://www.visembryo.com/baby/links.html

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