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Contribution to the Structure and Development of the Vertebrate Head

Contribution to the Structure and Development of the Vertebrate Head


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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.1895 Excerpt: ... - respectively, in the Cyclostomes. As I shall show later, the so-called paraphysis is a different structure. Beraneck showed that the pineal eye and epiphysis have been confused, and, on account of the existence of the nerve from outside sources, he argued for the complete independence of the pineal eye. i Klinckowstrom has placed himself in opposition to this opinion, showing the eye vesicle is formed as an outgrowth from the epiphysis. Next to the discovery of two or more epiphysial outgrowths may be mentioned the existence of accessory pineal eyes. The earliest publication containing an account of such structures is that of Duval and Kalt, in 1889. In a brief note (Des Yeux Pineaux Multiples chez 1'Orvet) these authors record the finding of two or three accessory pineal vesicles in Anguis. They do not say whether adult or embryonic forms were studied. Carriere ('89), in the same year, noted the occurrence in embryos of Anguis of a very rudimentary accessory pineal vesicle. Leydig ('90) observed these structures independently in, embryos of the same animals. He showed that there is much variability, both as to the presence and the histological structure of these accessory capsules. In some individuals they are lacking, and in others of the same age present and well developed. He records the occurrence, in some cases, of two accessory organs, a larger and a smaller one. The larger one resembles the pineal eye in structure and arrangement of pigment. The smaller one is very rudimentary. Leydig compared them to the ocelli of insects. It is clear from his account that variability and inconstancy are characteristics of these accessory organs. v Prenant, in the latter part of 1893, again records the occur rence of one accessory pineal eye in the embryos ...


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Product Details
  • ISBN-13: 9780217791199
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217791190
  • Publisher Date: 07 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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