File:Comparative zoology, structural and systematic - for use in schools and colleges (1883) (20482916158).jpg

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Title: Comparative zoology, structural and systematic : for use in schools and colleges
Identifier: comparativezool00orto (find matches)
Year: 1883 (1880s)
Authors: Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950
Subjects: Zoology; Anatomy, Comparative; Physiology, Comparative
Publisher: New York : Harper & Bros.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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THE NERVOUS SYSTEM. 175 The spinal cord is a centre for originating involuntary actions, and is also a conductor—propagating through its central gray matter the impressions received by the nerves to the brain, and taking back through its fibrous part the impulses of the brain. In Man, thirty-one pairs of nerves arise from the cord to supply the whole body, except the head. Each nerve has an ante- rior and a posterior root. The fibres of the former go to the muscles, and hence carry the impulses which cause muscular contraction (hence call- ed motor fibres); those of the posterior root con- vey sensations from the exterior to the central organs (sensory). The fibres leading from the brain to the cord cross nnP nnntliPr in fhp mp- FlG' 146--Rehltiou of the Sympathetic and Spinal one ctllObllUl ill Hie inu Nerves: c, fissure of spinal cord; a, anterior of dlllla Oblongata, SO that a dorsal sPinal nerve? *» Posterior root,with its ° ganglion; a', anterior branch; p\ posterior if the right Cerebral branch; s, sympathetic; e, its double junction . . it -; by white and gray filaments. hemisphere be diseased, the left side of the body loses the power of voluntary motion. The sympathetic nervous system is a double chain of ganglia, lying along the sides of the vertebral column in the ventral cavity. From these ganglia nerves are given off, which, instead of going to the skin and muscles, like the spinal nerves, form net-works about those internal organs over which the will has no control, as the heart, stomach,
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Flickr tags
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  • bookid:comparativezool00orto
  • bookyear:1883
  • bookdecade:1880
  • bookcentury:1800
  • bookauthor:Orton_James_1830_1877
  • bookauthor:Birge_E_A_Edward_Asahel_1851_1950
  • booksubject:Zoology
  • booksubject:Anatomy_Comparative
  • booksubject:Physiology_Comparative
  • bookpublisher:New_York_Harper_Bros_
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:183
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
18 August 2015


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