File:Keibel Mall 2 566.jpg

Fig. 566. Model of the mesonephros of a human embryo of 9.5 mm greatest length

(Embryo Ma. 3, from the collection of Professor Hochstetter, Vienna. The model was prepared by my students J. Klausler and Wydler.) Seen from in front. 75.

The two mesonephroi are slightly curved. The individual tubules are pressed together; the Malpighian corpuscles as a result no longer form a single row, but some are beginning to overlap their neighbors. All the tubules are bent into an S-shape. The opening of each tubule into the excretory duct lies about on a level with its Malpighian corpuscle, sometimes slightly more cranially, sometimes slightly more caudally. The various openings are not always the same distance apart. Some tubules are already broken down, on the right the 1st, 3rd and 4th, on the left the 1st, 2nd, 4th and 5th. Some have a common collecting duct, the 15th and 16th, the 19th and 20th. Some Malpighian corpuscles are entirely without tubules, 5a and 27 on the right, 22 on the left. Some tubules are completely formed, but have no opening into the excretory duct, on the right the 16th, on the left the 23rd. The excretory duct is widened in its caudal course from the opening of the 21st tubule, and beyond the opening of the last tubule it narrows again. Seen from in front the bladder appears foreshortened, one looks directly on the cloacal membrane.

Embryology - 27 Apr 2024        Expand to Translate
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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 27) Embryology Keibel Mall 2 566.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_566.jpg

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