Physiology, Practical and Descriptive

Physiology, Practical and Descriptive

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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. 1906 edition. Excerpt: ...are also improved. Test by Compass Points.--The delicacy of localizing touch is usually tested in this way. The blunted points of a light pair of compasses are allowed to rest gently on the skin of various parts of the body. If the two points are very close together, they will be felt as one pressure. That part which can best distinguish, as two points of touch, these blunt points, is considered the most sensitive. By this test the tip of the tongue is the most sensitive, being able to distinguish, as two separate points of contact, the tips of the compasses when only one twenty-fifth part of an inch apart. Following is the order of degrees of sensitiveness: tip of tongue, tips of fingers, lip, . tip of nose, eyelid, cheek, forehead, knee, neck; while the middle of the back seems least sensitive, the two points not producing two distinct sensations until they are more than two and a half inches apart. In general those parts which are most used, and those parts which are more freely movable, are most sensitive; for instance, the knee is much more sensitive than the middle of the thigh or the middle of the leg, and the elbow than the middle of the arm or forearm. If the compass points, about half an inch apart, be passed from the palm to the tips of the fingers, it will at first seem one line gradually separating into two diverging ones, owing to the keener. localizing power as the finger tips are approached. Reference of Sensation to the Region of Nerve Endings.--If the "funny bone," or "crazy bone," be hit, z'.e. if the ulnar nerve be bruised against the bone, sharp pain may be felt in the wrist and hand, and soreness of these parts may be felt for days, though they are not in the least injured, but only the...show more

Product details

  • Paperback | 150 pages
  • 189 x 246 x 8mm | 281g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236753267
  • 9781236753267