File:Keibel Mall 2 531.jpg

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Fig. 531 a and b. human embryo of 2.5 mm greatest length

Human embryo of 2.5 mm greatest length and with 23 pairs of primitive segments. (Embryo R. Meyer 300, from the collection of Professor R. Meyer, Berlin.)

a. Reconstruction of the left pronephric and mesonephric anlagen. The figures by Thompson were employed for the reconstruction. The pronephros consists of seven tubules; the most anterior in the 9th segment is in process of degeneration, the 2nd-5th have united to form the collecting duct, the 6th tubule is still free, but is about to unite with the 5th and 7th. The 7th is continued into the free terminal portion of the primary excretory duct and this extends to the unsegmented mesoderm. Beyond the 7th tubule is the beginning of the nephrogenic cord and in the region of the 13th-15th segments mesonephric vesicles are developed within this.

b. Shows the pronephros under a higher magnification.



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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 2 531.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_531.jpg

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