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Home > General > Inaugural Dissertation on the Phsiological Inferences to Be Deduced from the Structure of the Nervous System in the Invertebrated Classes of Animals
Inaugural Dissertation on the Phsiological Inferences to Be Deduced from the Structure of the Nervous System in the Invertebrated Classes of Animals

Inaugural Dissertation on the Phsiological Inferences to Be Deduced from the Structure of the Nervous System in the Invertebrated Classes of Animals


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1839 edition. Excerpt: ...evident; and perhaps the latter is also to be regarded as connected with the sense of smell. 56. From the posterior collar, --which evidently corresponds with the sub-oesophageal ganglion of the Limax and other Gasteropoda, in which are united the pedal palleal, and branchial ganglia, --filaments are distributed to the shell-muscles, and four others arise from it which pass backwards along the course of the vena cava: of these the two internal form a plexus upon the vein; whilst the two external, which are trunks of considerable size, swell into ganglia, from which ramifications are distributed to the digestive and reproductive organs. This distribution resembles that found in many of the higher Gasteropods inhabiting spiral shells; and the system of nerves may be termed branchio-visceral. The external respiratory nerves, however, that supply the muscular edges of-the mantle, and the muscles of the funnel, by the movements of which the respiratory currents are produced, arise from the anterior sub-oesophageal mass, which has been spoken of as partly corresponding with the pharyngeal ganglion or medulla oblongata. There is nothing surprising in this change of situation, since we have alreadyhad to notice how constantly the position of the nervous centres is governed by that of the organs they supply; and, in this conjunction of the centres of the stomato-gastric and respiratory systems, and their approximation towards the cephalic ganglion, we recognise an evident approach towards the type of the Vertebrata. 5'7. The supra-oesophageal or cephalic mass of the Sepia, (Figs. 11, 12, ) evidently possesses a much higher character than that of the Nautilus. In the latter there existed, on the median line, only a sort of commissiue, ...


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Product Details
  • ISBN-13: 9781234036997
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1234036991
  • Publisher Date: 13 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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