An Introduction to Entomology, Vol. 4 of 4: Or Elements of the Natural History of Insects (Classic Reprint) - Hardcover

Kirby, William

9780267421596: An Introduction to Entomology, Vol. 4 of 4: Or Elements of the Natural History of Insects (Classic Reprint)

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ISBN 10: 0267421591 ISBN 13: 9780267421596

Publisher: Forgotten Books, 2018

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Excerpt from An Introduction to Entomology, Vol. 4 of 4: Or Elements of the Natural History of Insects

Radiata, or star-fish and sea - urchins 3. Thetliird, the; glanglionic, is where the nervo'us system. Cohsistsrof a seriesof ganglions connected by nervous threads or a me dullary chord, placed, except the first ganglion, below the intestines, from which proceed nerves to the various parts Of the body. This system may be considered as divisi ble into two - the proper ganglionic, 'in which it IS gan-l gli'onic with the ganglions arranged in a series with a' double spinal chord. This prevails in the classes Insecta,. Crustacea, Arac/znida, 8tc., and.the improper ganglionic; in which it is ganglionic with the ganglions dispersed irregularly, but connected by nervous threads, as in the Mollusca In the fourt/z, the cerebro-spinal, the ner vous tree may be said to be double, or to consist of two systems - the first taking its origin in a brain formed oi2 two hemispheres, contained, in the cavity of the head,, from which posteriorly proceeds a spinal marrow, in' cluded in a dorsal vertebral column. These, send forth' numerous nerves to the organs of the senses and the. Muscles of the limbs. The second consists of two prin-y cipal ventral chords, which by their'ganglions, but with out any, direct communication, anastomose with the Spinal, nerves and some Of those of the brain, and run one on. Each side from the base of the-skull to the extremity of. The sacrum. This system consists Of an assemblage of nervous filaments bearing numerous ganglions, from. Which nervous threads are distributed to the'organs of.

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