. Comparative anatomy. Anatomy, Comparative. posterior cardinal vein collecting vein connecting sub-and post, cardinals. capsule mesonephric duct subcardinal vein A, B. Fig. 359.—Diagrams showing the relations of the blood vessels to a mesonephric tubule. (From Patten's "Embryology of the Pig," based on figures by McCallum.) the nephrogenic cord in the lumbar region. In a 6 mm. human embryo, the ureter appears in the form of a hollow outgrowth from the mesonephric duct near its posterior end. At its anterior end, this outgrowth expands into a vesicular enlargement. Growing dorsally,
. Comparative anatomy. Anatomy, Comparative. posterior cardinal vein collecting vein connecting sub-and post, cardinals. capsule mesonephric duct subcardinal vein A, B. Fig. 359.—Diagrams showing the relations of the blood vessels to a mesonephric tubule. (From Patten's "Embryology of the Pig," based on figures by McCallum.) the nephrogenic cord in the lumbar region. In a 6 mm. human embryo, the ureter appears in the form of a hollow outgrowth from the mesonephric duct near its posterior end. At its anterior end, this outgrowth expands into a vesicular enlargement. Growing dorsally, the vesicle comes in contact with the nephrogenic cord which covers it as a cap. As the ureter elongates, the nephrogenic cap is pushed anteriorly, and takes a position dorsal to the posterior portion of the mesonephros. (Fig. 360) The vesicular enlargement of the ureter becomes the pelvis. Two outgrowths from it, one anterior and one posterior, form two major calyces. Two more are added later between the first two. Minor caly- ces arise by the continued subdivision and branching of the major calyces. Further branching to the twelfth generation produces the collecting tubules and the medullary portion of the kidney. Those of the fifth generation to the number of twenty to eighty for each renal calyx. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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