. The chordates. Chordata. Fig. 84. A diagram illustrating the repeated branching of the collecting tubules in a nine-week (30 mm.) human embryo. Roman numerals indicate successive branchings. The diagram shows also the origin of excretory tubules from the nephrogenic tissue. (Redrawn from Braus, after Kampmeier. (Courtesy, Neal and Rand: "Chordate Anatomy," Philadelphia, The Rlakiston Company.) Proximal convoluted tubule. Fig. 85. Diagrams of the finer structure of a mammalian kidney. {Left) A sec- tion of the entire kidney showing the contrast between cortical and medullary regions
. The chordates. Chordata. Fig. 84. A diagram illustrating the repeated branching of the collecting tubules in a nine-week (30 mm.) human embryo. Roman numerals indicate successive branchings. The diagram shows also the origin of excretory tubules from the nephrogenic tissue. (Redrawn from Braus, after Kampmeier. (Courtesy, Neal and Rand: "Chordate Anatomy," Philadelphia, The Rlakiston Company.) Proximal convoluted tubule. Fig. 85. Diagrams of the finer structure of a mammalian kidney. {Left) A sec- tion of the entire kidney showing the contrast between cortical and medullary regions. The relations of the chief arteries and veins are indicated. {Right) A recon- struction of a single excretory tubule, showing its relation to the glomerulus, its differentiation into a proximal convoluted region, loop of Henle, and a distal convoluted region whence it emerges from the cortex and passes on into one of the collecting tubules of the medulla. The relations of blood-vessels to the excretory structures are 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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