File:Keibel Mall 2 565.jpg

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Fig. 565. Model of the mesonephroi, the metanephroi and the bladder of a human embryo of 7 mm greatest length

(Embryo Chr. 1, from the collection of Professor Hochstetter, Vienna. The model has been prepared by my students A. Wachter and E. vonWyss.) View from in front. 75.

The mesonephroi have a perpendicular position and the individual tubules are at sufficient distances, so that the Malpighian corpuscles lie in a single row. The lowest tubules are still developing, but have already united with the excretory duct (Fig. 561 e). The fully developed canals are S-shaped. Most ventrally are the Malpighian corpuscles, then in the middle is the secreting tubule and most dorsally the collecting tubule. The loop formed by the secreting and collecting tubules usually has not yet reached the medial border of Bowman's capsule. The whole coil of a mesonephric segment (Malpighian corpuscle and the two tubules) lies still in one horizontal plane. The primary excretory duct is narrow in its upper part and only widened in a spindle-shaped manner corresponding to the entrance into it of a collecting tubule; in its lower portion it is remarkably wide and the spindle-like enlargements have disappeared. Towards the bladder the duct narrows again. The ureters are short and almost straight canals terminating in club-shaped enlargements.

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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.

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Cite this page: Hill, M.A. (2024, April 26) Embryology Keibel Mall 2 565.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_565.jpg

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