File:Keibel Mall 2 524.jpg

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Fig. 524 a, b and c. Diagram of the development of a pronephric segment

The segment stalk is hatched, the principal tubule is black,

a. The principal tubule arises as an evagination of the parietal layer of the primitive segment stalk, its lumen being continuous with that of the segment stalk and through this with that of the lateral plate,

b. The segment stalk has lost its connection with the secondary primitive segment, its medial portion has become converted into mesenchyme tissue and its lateral part has united with the principal tubule. The lateral part of the stalk thus becomes a tubule supplemental to the principal tubule,

c. The supplemental tubule (hatched) becomes divided into the inner pronephrie chamber and the nephrostome canal. A glomerulus, forming the internal glomerulus and supplied by the aorta, invaginates into the inner pronephrie chamber, the external glomerulus projects into the general body cavity (ccelom of the lateral plate). The pronephric segment is now complete in all its parts; starting from the collecting duct we have the principal tubule, the pronephrie chamber with the internal glomerulus, the nephrostome canal and the external glomerulus.



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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 25) Embryology Keibel Mall 2 524.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_524.jpg

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