Brain and Spinal Cord; A Manual for the Study of the Morphology and Fibre-Tracts of the Central Nervous System

Brain and Spinal Cord; A Manual for the Study of the Morphology and Fibre-Tracts of the Central Nervous System

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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. 1918 edition. Excerpt: ...substance differ also in their functional relations. The chromophilic substance is wanting in the protoplasm of a large number of nerve-cells and, therefore, does not represent a vital element of the nerve-cell. It accumulates during the resting condition, is sometimes notably reduced during the period of activity and disappears in lesions of the neurone, to reappear in generous quantity, however, after temporary injury and recovery of the cell. These characteristics seem to prove, that the chromophilic substance exercises a nutritive rather than a nervous function. The chromophobic substance seems to represent the element possessing the function of conducting the nervous stream, the fibrillae and the perifibrillar substance probably sharing in this conduction. In addition to the Nissl bodies, the protoplasm of many cells contains pigment granules, which are usually disposed in groups of variable size. The pigment is commonly not uniformly distributed within the cell, but arranged at the base of one of the dendrites. It is wanting during early life and increases with age. Marinesco regards the pigment granules as regression-.and age-products of the nerve-cells. Claiming mention are, further, the fine channels, the canals of Holmgren, which lie within the interior of the cell and communicate with the lymph-canals situated outside the nerve-cell. The nucleus of the nerve-cells appears as a clear spherical vesicle, possesses a distinct nuclear membrane and lies most frequently in the middle of the cell. Within the nucleus are found one or several deeply staining nucleoli, which often contain still smaller bodies, the nucleololi. The remaining interior of the nucleus is traversed by a meagre supporting substance, the linin framework, on which more

Product details

  • Paperback | 84 pages
  • 189 x 246 x 4mm | 168g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236512375
  • 9781236512376