Pharmacology and Therapeutics; Or, Medicine Past and Present

Pharmacology and Therapeutics; Or, Medicine Past and Present

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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. 1880 edition. Excerpt: ...to ascertain whether this was so or not, Bernard adopted a most ingenious method of experiment. It was evident that the paralysis of the motor nerves, which the curare produced, would completely destroy the usual means of communication between the nerve-centres and the muscles, and thus prevent the brain or spinal cord from setting the muscles into action. These centres might, therefore, still retain their functions unimpaired, although they had no power to manifest them. In order to give them an opportunity of doing this, it was necessary to exclude one limb from the action of the poison, in order that, by retaining its power to move, it might act as an index to what was going on in the nerve-centres. Bernard accordingly tied the artery and vein in the leg of a frog, close to the knee, and then introduced some curare under the skin of the back. The poison was soon carried by the blood to every prt of the body, excepting that from which the circulation had been cut off by the ligature. In the accompanying figure, the poisoned parts are shaded, while the unpoisoned part is unshaded. When the whole frog was poisoned, Bernard observed that pinching the skin produced no move 9o SENSORY NERVES AND CORD. ment in any part of the body; but he now found that, while no movement took place in the poisoned part, pinching the skin on any part of the body was followed by movements of the non-poisoned leg. It was then clear that the sensory nerves and spinal cord retained their functions, and that the want of movement in the poisoned parts of the body was due only to the paralysis of the motor nerves, which prevented the spinal cord from setting the muscles in these parts into action. When, for example, the skin of the poisoned leg (which in the diagram...show more

Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236868560
  • 9781236868565