The Medical Standard Volume 19

The Medical Standard Volume 19

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ...and is represented in the mammalian kidney by nothing more than the constricted neck which joins the capsule to the convoluted tubule; we may speak of it as the first conducting portion. The succeeding part is a wider tube lined with cells which bear no cilia, but whose free border is beset by short narrow, rigid processes, like short bristles. This is obviously an excreting portion, and we speak of it as the first excreting portion; it corresponds to the first convoluted and the spiral tubules of the mammalian kidney; the cell-substance is not striated as in the mammal. There next follows a section in which the tubule is of a much narrower diameter, and the cells, formed of clear cell-substance, again bear long cilia, constituting the second conducting portion. This is in turn succeeded by a division of a much larger diameter in which the cells are most distinctly striated, and otherwise resemble the cells of the convoluted tubules of the mammalian kidney, thus constituting the second excreting portion. The succeeding portions of the tubule have the character of conducting tubules, and join their fellows to fall ultimately into the ureters. Obviously, the second excreting portion is represented in the mammal by the second convoluted tubule, the zigzag tubule and the ascending limb of the loop of Henle, while the descending limb of the same corresponds to the second conducting ciliated portion of the amphibian tubule. The cilia, however, have entirely disappeared, and the likeness is confined to the narrowness of the whole tubule and the absence of excreting characters in the cells. Why, however, the kidney of the lower animals possesses the reduplication of the excreting and conducting portions, and why remains and remains only of the...
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Product details

  • Paperback
  • 189 x 246 x 19mm | 635g
  • United States
  • English
  • black & white illustrations
  • 123693654X
  • 9781236936547