File:Bailey317-319.jpg

Figs. 317, 318 and 319. From reconstructions of convoluted renal tubules in successive stages of development

Stoerk.

The Convoluted Renal Tubules and Glomeruli.

• As stated above, the metanephric blastema or nephrogenic tissue surrounds the renal pelvis and the straight tubules.
• It represents a condensation of the mesenchyme and is destined to give rise to the convoluted tubules and glomeruli.
• The cells of the blastema in the region of the ampullae of the terminal straight tubules acquire an epithelial character and become arranged in solid masses (Fig. 315).
• Each mass unites with an ampulla and acquires a lumen, which becomes continuous with the lumen of the straight tubule, then elongates and forms an S-shaped structure (Figs. 316 and 317).
• The loop of the S nearer the straight tubules elongates still more and grows toward the pelvis, parallel with the straight tubules, to form Henle's loop.
• The part between Henle's loop and the straight tubule elongates and becomes convoluted to form the proximal part of a convoluted renal tubule (second convoluted tubule) .
• The part between the distal end and Henle's loop elongates and becomes convoluted to form the distal part of a convoluted renal tubule (first convoluted tubule) (Figs. 318 and 319).

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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 24) Embryology Bailey317-319.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey317-319.jpg

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