File:Keibel Mall 2 522.jpg

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Fig. 522. Transverse section of a human embryo 1.73 mm in length

With 9-10 pairs of primitive segments (somites).

(determined from the series). (Embryo R. Meyer No. 335, from the collection of Professor R. Meyer, Berlin; slide 7, row 2, section 2.) x 135.


The embryo is torn in the region of the medullary tube; there is a medullary tube and not a medullary groove. The yolk-sack is greatly folded, so that it appears as if divided into two portions; hence the peculiar appendage on the right side of the figure, which ia the connection with the second portion of the yolk-sack, not represented. The section passes through about the middle of the 7th primitive segment. The lateral plate contains a single wide ccelomic cavity, which is not, however, in communication with the exoccelom. The segment stalk is not distinguishable from the lateral plate. The visceral mesoblast of the yolk-sack is giving rise to the rete peri-intestinale.


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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 2 522.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_522.jpg

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