File:Keibel Mall 2 549.jpg

From Embryology

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Fig. 549. Transverse section of a human embryo of 12.5 mm greatest length

At a level between the 18th and 19th trunk segments. (Embryo Ma. 1, from the collection of Professor Hochstetter, Vienna; slide 8, row 4, section 5.) X 50.

The urogenital fold has completely altered its position; its base is sagittal and the tip in the neighborhood of the excretory duct has become the summit of the fold, so that a dorsal and ventral slope must be recognized. The lateral bay of the body cavity has penetrated to the medial surface of the the V. cardinalis post. Throughout almost the whole region of the ventral slope the reproductive gland has developed and, by its growth dorsally, the Malpighian corpuscle has been forced in that direction. A groove between the excretory duct and the lateral border of the reproductive gland begins to separate the reproductive gland area from the urogenital fold; consequently the summit of the fold containing the excretory duct projects in a tongue-like manner.


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Felix W. The development of the urinogenital organs. In Keibel F. and Mall FP. Manual of Human Embryology II. (1912) J. B. Lippincott Company, Philadelphia. pp 752-979.

XIX Development of the Urinogenital Organs: Excretory Glands and their Ducts | Reproductive Glands and their Duct | Urogenital Union | External Genitalia | Figures | Literature
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Cite this page: Hill, M.A. (2024, April 27) Embryology Keibel Mall 2 549.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_549.jpg

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