File:Bailey311.jpg

Fig. 311. From a reconstruction of the anlage of the kidney (metanephros) of a human embryo at the beginning of the 5th week

Schreiner.

The Ureter, Renal Pelvis and Straight Renal Tubules. During the fourth week (in embryos of about 5 mm.) a small, hollow, bud-like evagination appears on the dorsal side of each mesonephric duct near its opening into the cloaca. The evagination continues to grow dorsally in the mesenchyme toward the vertebral column, and at the same time becomes differentiated into two parts, a narrow stalk and a dilated terminal portion. The stalk is the forerunner of the ureter, the dilated end is the primitive renal pelvis (Figs. 311 and 313). When the dilated end reaches the ventral side of the vertebral column it turns and grows cranially between the latter and the mesonephros. The stalk (or ureter) elongates accordingly (Fig. 312).

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Reference

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.

Cite this page: Hill, M.A. (2024, April 26) Embryology Bailey311.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey311.jpg

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