The Segmentation of the Nervous System in Squalus Acanthis; A Contribution to the Morphology of the Vertebrate Head
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The Segmentation of the Nervous System in Squalus Acanthis; A Contribution to the Morphology of the Vertebrate Head

The Segmentation of the Nervous System in Squalus Acanthis; A Contribution to the Morphology 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.1898 Excerpt: ... dence would seem to tell in favor of the view that this mesoderm segment, like the following ones, is to be regarded as of somatic value.1 d. Summary. Neuromeres and somites show an exact numerical correspondence throughout the length of the embryo. The serial alternation of myelomeres and somites evinces the metamerism of the former, while the exact numerical correspondence of the encephalomeres and head somites appears equally convincing evidence of the metameric value of the encephalomeres. The head somites in Squalus are homologous with those described by van Wijhe ('82) for Scyllium and Pristiurus, and there is yet another anterior to these, viz. the "anterior" somite first 1 As the most anterior of the cavities of the Selachian embryo, it would seem more probable that the anterior cavities described by Miss Platt should be homologized with the "head cavities" (vordere Entodermtasche) of Amphioxus, than that the next following, the premandibular, should be. Fig. E. A cross section through the "anterior cavity" (frontal section of the embryo) in an embryo with 78 somites. X 240. To show the proliferation of cells into the myocoel from the median wall of the cavity. 1, 2, first and second head cavities; a, "anterior cavity" (Piatt); ec'drm., ectoderm; vs. opt., optic vesicle. seen by van Wijhe in Galeus. The somatic value of the post-otio head somites is indisputable. The pre-otic somites, five in all, are also in my opinion homodynamous with trunk somites. They are segments of the dorsal mesoderm (with the possible exception of the "anterior "), which, as exemplified in the third somite (van Wijhe's), become differentiated into myotome and sclerotome. While the "anterior" and the fourth somites become rudimentary and develop no muscle fibres, the eye mu...


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Product Details
  • ISBN-13: 9781150021787
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1150021780
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr


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The Segmentation of the Nervous System in Squalus Acanthis; A Contribution to the Morphology of the Vertebrate Head
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