The Physiological Anatomy and Physiology of Man; In Two Volumes Volume 2

The Physiological Anatomy and Physiology of Man; In Two Volumes Volume 2

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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. 1856 edition. Excerpt: ...inches and a half; the stretching power being removed, it contracted again to six inches, "which," says Hunter, "we must suppose to be the middle state of the vessel." These powers inherent in the arterial wall, of yielding under a distending force, and reacting upon its contents with a force equal to that of the primitive disturbing one, and also that of muscular contraction, exercise an important influence in promoting or directing the circulation of the blood through the arterial system. The elastic element of the arterial tunic is always developed in the direct ratio of the size of the artery; and the muscular element, although perhaps not bearing an inverse proportion to the size of the artery, yet becomes more prominent and distinct as the elastic tissue diminishes in coarseness and in strength. Thus it is in the smaller arteries that we notice the most perfect arrangement of muscular fibres, and in these the fibrous tissue is reduced to its internal longitudinal fibrous layer, the external circular fibres having disappeared. Blood-vessels and nerves are freely distributed to the arterial tunics. To the former, allusion has already been made in describing their external tunic. We have no evidence that these bloodvessels penetrate further than to a slight depth into the fibrous tunic. It is probable, therefore, that they are destined to nourish the external tunic, and a portion (chiefly the muscular element) of the fibrous tunic, leaving the remainder of the arterial wall to imbibe its nutrition directly from the blood itself. The general arrangement of the nerves on the outer coat of arteries has been already described (vol. i. p. 223, and vol. ii. Chap, xx.) The plexuses formed are chiefly conducted by more

Product details

  • Paperback | 278 pages
  • 189 x 246 x 15mm | 499g
  • English
  • Illustrations, black and white
  • 1236950380
  • 9781236950383