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Fig. 521. Transverse section of a human embryo of 1.3S mm greatest length

(as determined from the series) and with 5-6 pairs of primitive segments (somites). (Embryo Pfannenstiel-Kromer, from the collection of Professor Pfannenstiel; slide 6, row 3, section 7.) x 120.

The section passes on the right through the 6th segment and on the left through the primitive segment plate at the level of the future 7th segment. The section shows the ccelom relations. Only the exoccelomis present. On the right there is no apparent differentiation of the intra-embryonic mesoderm; on the left a beginning differentiation of the secondary segment, the segment stalk and the lateral plate is visible and is indicated by two crosses (x). The periintestinal rete and the anlagen of the aorta can be seen. An injury to the embryo accounts for the peculiar bending downward of the endoderm and visceral mesoblast in the left side.


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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, March 28) Embryology Keibel Mall 2 521.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_521.jpg

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