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==Fig. 525. Human embryo with a length of 1.73 mm==


With 9-10 pairs of primitive segments (determined from the series). (Embryo R. Meyer 335, in the collection of Professor R. Meyer, Berlin; slide 7, row 3, section 4.) x 135.
The section passes on the right side through the cranial wall of the 8th primitive segment, on the left through the interstitium between the 7th and 8th segments (reversed in the figure). The ccelom is continuous with the exoccelom, the original boundary between them being marked by the vena umbilicalis. The ccelom is greatly enlarged, only the medial portion, corresponding to the primitive segment stalk, remaining narrow. On the left side of the figure the coelom of the primitive segment stalk and that of the lateral plate are separate, and the parietal layer of the segment stalk is out-pouched to form the first pronephric principal tubule.
{{Human Embryology Manual 2 19}}
[[Category:Renal]][[Category:Mesoderm]]

Latest revision as of 16:45, 14 November 2018

Fig. 525. Human embryo with a length of 1.73 mm

With 9-10 pairs of primitive segments (determined from the series). (Embryo R. Meyer 335, in the collection of Professor R. Meyer, Berlin; slide 7, row 3, section 4.) x 135.

The section passes on the right side through the cranial wall of the 8th primitive segment, on the left through the interstitium between the 7th and 8th segments (reversed in the figure). The ccelom is continuous with the exoccelom, the original boundary between them being marked by the vena umbilicalis. The ccelom is greatly enlarged, only the medial portion, corresponding to the primitive segment stalk, remaining narrow. On the left side of the figure the coelom of the primitive segment stalk and that of the lateral plate are separate, and the parietal layer of the segment stalk is out-pouched to form the first pronephric principal tubule.


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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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