The Labyrinth

The Labyrinth

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...When only one labyrinth is examined at a time a current of 5 to 10 ma is necessary. The position of the head has no influence on the character or direction of the nystagmus in this test. When the labyrinth, as well as the vestibular nerve are destroyed, the galvanic current does not cause any nystagmus. However, if the vestibular nerve is not yet degenerated, it will respond to the stimulation. If the anode is placed over the sternum, and two sponges are attached to the kathode, one of which is placed before each ear, there will be no nystagmus, if both labyrinths are normal. If one labyrinth is destroyed, or if its excitability is diminished, there will result a nystagmus toward the sound ear. If a double anode be placed before the ears the nystagmus will be toward the diseased ear. However, in order to elicit a nystagmus with a double electrode, a very strong current is necessary. In fact, the required current may be so strong as to cause unendurable pain to the patient. The actual method of stimulation of the end-organs in the labyrinth by means of the galvanic current is not yet positively known. The most plausible hypothesis is that laid down by Briinings, which is as follows; the galvanic current sets up a kataphoretic current in the endolymph, or the cupula is set into motion directly by the kataphoresis. As a result of this movement of the endolymph or cupula, the hair-cells are stimulated. Kataphoresis is an electro-endosmosis. It is a motion which is produced in liquids by the galvanic current, the fluid moving from one pole to the other. Solid particles which are present in the fluid are also set into motion. On the basis of this theory it would seem that the kataphoretic movement in the endolymph is away from the kathode and more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236488911
  • 9781236488916