File:Hand-book of physiology (1892) (14762995024).jpg

Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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of nervous matter divided by fissures intoconvolutions (fig. 356), and covering to a large extent the otherparts, separated from one another by a deep fissure running fromfront to back. These constitute the cerebral hemispheres or cere-brum, (b.) On the under or central surface of the brain can beseen a broad mass rounded on the surface more or less quadri-lateral in shape ; this is the pons Varolii (fig. 354, VI.). Anteriorlyit is seen to branch off into two strands, which are the crura,cerebri; and posteriorly it joins with a narrower portion, which is the CH. xvi.) THE DIFFERENT PARTS OF THE BRAIN. 599 medulla oblongata or bulb. This latter is continuous with thespinal cord. In connection with the bulb and pons are seen manynerve-trunks passing off; these are the chief part of the cranialnerves. Two of the cranial nerves, however, are more anterior,and one, the optic (fig. 354, 2), is seen to send off a broad band offibres which apparently passes into the substance of the cerebrum.
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Fig. 354.—Base of the brain, i, superior longitudinal fissure; 2, 2, 2, anterior cerebrallobe; 3, fissure of Sylvius, between anterior and 4, 4, 4, middle cerebral lobe ; 5, 5,posterior lobe; 6, medulla oblongata; tbe figure is in the right anterior pyramid ;7, 8, 9, 10, the cerebellum ; -4-, the inferior vermiform process. The figures from I. toIX. are placed against the corresponding cerebral nerves; III. is placed on the rightcrus cerebri. VI. and VTI. on the pons Varolii; X. the first cervical or suboccipitalnerve. (Allen Thomson.) £. The most anterior nerve-root on either side, viz., the olfactory (fig.354, 1), extends for some distance upon the under surface of eachcerebral hemisphere, (c.) The pons is seen to be connected laterallywith a large mass of nervous matter, upon which in the position ofthe brain turned upwards, the bulb also rests; this is the cerebellum,and (d.) When the brain is viewed in the normal position at thebottom of the fissure, between the hemispheres is

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