File:Keibel Mall 2 533.jpg

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Fig. 533 a, b and c. Three sections through the caudal end of the primary excretory duct

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; slide 13, row 4, sections 5, 6 and 7.) X 15O.

a. The end of the primary excretory duct is still to be distinguished from the ectoderm,

b. Between the end of the primary excretory duct, consisting of a single cell, and the ectoderm there is interposed a cell in the act of division; whether it belongs to the ectoderm or the duct is uncertain,

c. Section immediately behind the end of the duct; the ectoderm does not show the slightest alteration. The rete peri-intestinale between the visceral mesoblast and the intestine.


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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 24) Embryology Keibel Mall 2 533.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_533.jpg

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