Archive image from page 356 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 THE METANEPHROS 34- eleven and thirteen, each tubule of the final generation having its cap of blastema. In this way there is formed a complicated branching system of tubules all of which ultimately communicate with the primary renal pelvis, and all of which have, in the last analysis, had their origin from the Wolffian duct. They represent, however, only the collecting portions of the uriniferous tubules, their excreting por- Fig
Archive image from page 356 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 THE METANEPHROS 34- eleven and thirteen, each tubule of the final generation having its cap of blastema. In this way there is formed a complicated branching system of tubules all of which ultimately communicate with the primary renal pelvis, and all of which have, in the last analysis, had their origin from the Wolffian duct. They represent, however, only the collecting portions of the uriniferous tubules, their excreting por- Fig. 213.—Four Stages in the Development of a Uriniferous Tubule of a Cat. A, Arched collecting tubule, C, distal convoluted tubule; C, proximal convoluted tubule; H, loop of Henle; M, glomerulus; T, renal vesicle; V, ampulla (drawn from reconstructions prepared by G. C. Huber). tions having yet to form, and these take their origin from the meta- nephric blastema. When the terminal collecting tubules have been formed the blastemic cap in connection with each one condenses to form a renal vesicle (Fig. 213, A, T), which is at first solid, but later becomes hollow and proceeds to elongate to an S-shaped tubule, one end of which becomes continuous with the neighboring ampulla (Figs. 212, B, and 213, B), and in the space enclosed by_what may be termed the lower loop of the S a collection of mesenchyme cells
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