Identifier: treatiseonphysi00hutc (find matches)
Title: A treatise on physiology and hygiene for educational institutions and general readers ..
Year: 1884 (1880s)
Authors: Hutchison, Joseph C. (Joseph Chrisman), 1822-1887
Subjects: Physiology
Publisher: New York, Clark & Maynard
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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lies slothfully or aimlessly dreaming, the fatal habit settles onhim like a vampire and sucks his blood, fanning him all the while with its hotwings into deeper slumber or idler dreams.—Holmes The Autocrat of the,Breakfast- Table, THE NERVOUS SYSTEM. 187 10. The Cerebellum.—The little brain is placed beneath theposterior part of the cerebrum, and, like the latter, is divided intohemispheres. Like it, also, the surface of the cerebellum is com-posed of gray matter, and its interior is chiefly white matter. Ithas, however, no convolutions, but is subdivided by many parallelridges, which, sending down gray matter deeply into the white,central portion, give the latter a somewhat branched appearance.This peculiar appearance has been called the arbor vitce, or thetree of life, from the fact that when a section of the organ ismade, it bears some resemblance to the trunk and branches of atree (Fig. 50, F). In size, this cerebellum, or little brain, is lessthan one-eighth of the cerebrum.
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Fig. 51.—Lower Surface of the Brain. The numbers refer to the pairs of nerves. II. From the under surface of the cerebrum, and from the frontmargin of the cerebellum, fibres collect together to form the medullaoblongata (Fig. 51, Ma), which, on issuing from the skull, entersthe spinal column, and then becomes known as the spinal cord. 10. Location of the little brain? How divided? Its surface and interior? Its sub-divisions ? Its size ? 11. Medulla oblongata? Cranial nerves? Their shape and position ? 188 THE NERVOUS SYSTEM. From the base of the brain, and from the sides of the medullaoriginate, also, the cranial nerves, of which there are twelve pairs. These nerves are round cords of glisten-ing white appearance, and, like thearteries, generally lie remote from thesurface of the body, and are well pro-tected from injury. 12. The Spinal Cord—The spinalcord, or marrow,7 is a cylindrical massof soft nervous tissue, which occupies achamber, or tunnel, fashioned for it inthe spinal co

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