The American Anatomical Memoirs Volume 7-11

The American Anatomical Memoirs Volume 7-11

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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. 1915 edition. Excerpt: ...long, cylindrical elements in which may be differentiated an outer thread-like part and a more cylindrical portion. The nucleus occupies an enlargement in the area of transition between these two portions. The inner cylindrical parts lie close together; the outer thread-like parts have broad spaces between them in which are lodged neuroglia and some ganglionic cells. The peripheral processes come to the surface of the retina and spread out against the membrana limitans externa. The pigment in the cells is in some cases arranged in transverse bands or stripes, according to Spencer366 in Sphenodon and Leydig ('91),238 in Anguis. All of the rod cells are similar. The connection of the retinal elements with fibers of the parietal nerve is not yet altogether understood. In adults the organ is rudimentary. It is not known whether the nerve fibers come from the large retinal elements, from the ganglionic cells of the deep retinal layer, or from the large cylindrical cells of the inner layer. The latter seems most probable in view of the conditions in Petromyzon. The parietal nerve. This nerve was first described by Spencer366 in 1886 and has been observed by many others since then. Spencer believes that the parietal nerve is connected with the end of the epiphysis, that is to say, a direct continuation of the pineal organ. The entire course of the parietal nerve from the parietal eye to the brain roof was first traced by Strahl and Martin383 in 1888 in older embryos of Lacerta vivipara and Anguis fragilis. These observers showed that the nerve was completely independent of the epiphysis. Beraneck23 in 1892 made more exact studies and confirmed the view of Strahl and Martin. Other authors are also emphatic in stating the complete independence between more

Product details

  • Paperback | 214 pages
  • 189 x 246 x 11mm | 390g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236575016
  • 9781236575012