. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. it is to be presumedthat they exist in this organ. 736. The CEREBELLUM is about seven times smaller thanthe cerebrum. Like that organ, i^ is composed of white and 733. Describe the appearance of the brain when a horizontal section hasbeen made. What is the gray border often called ? What connects thehemispheres ? 734. Describe the ventricles of the brain. In the diseasecalled dropsy of the brain, where is the water deposited? 735. Whatis the character of the brain in childhood? In adults ? 736. How
. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. it is to be presumedthat they exist in this organ. 736. The CEREBELLUM is about seven times smaller thanthe cerebrum. Like that organ, i^ is composed of white and 733. Describe the appearance of the brain when a horizontal section hasbeen made. What is the gray border often called ? What connects thehemispheres ? 734. Describe the ventricles of the brain. In the diseasecalled dropsy of the brain, where is the water deposited? 735. Whatis the character of the brain in childhood? In adults ? 736. How doesthe cerebellum compare in size with the cerebrum? 332 ANATOMY, PHYSIOLOGY, AND HYGIENE. gray matter, but the gray constitutes the larger portion. Itssurface is formed of parallel plates separated by white matter is so arranged, that when cut vertically, theappearance of the trunk and branches of a tree {arbor vita)is presented. It is situated under the posterior lobe of thecerebrum, from which it is separated by a process of the duramater, called the ten-tori-um. Fig. Fig. 123. The under surface, or base, of the brain and origin of the cranial , The anterior lobes of the cerebrum. 2,2, The middle lobes. 3,3, The poste-rior lobes, almost concealed by the cerebellum. 4, 4, The cerebelluui. 7, 7, Thelongitudinal fissure that divides tA brain into two hemispheres. 8, The first pairof nerves. 9, 9, The seconil pair of nerves. 10, The decussation, or crossing, of it3fibres. 13, 13, The third pair of nerves. 14, The pons varolii, 15, 15, The fourthpair of nerves. 16, 16, The fifth pair of nerves. 17, The sixth pair of nervesJ8, 18, The seventh and eighth pair of nerves. 19, The medulla oblongata, with hecrossing of some of its fibres exhibited. 20, The ninth pairof nerves. 21, The te » nerves. 22, The eleventh pair of nerves. 23, The twelfth pair of nerve. Describe this portion of the brain. Explain fig. 122. ANATOMY OF THE NERVOUS SYSTEM. 3
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