Outlines of human physiology; designed for the use of the higher classes in common schools . of the brain was made to conformto the skull, though in fact there is no doubt that thebrain gives the form to the bone. On its outer surface,it is of an ash color: this has hence been called thecineritious portion, and, from its position, it has beenknown under the name of the cortical part, as if itformed a covering to the whole, like the bark of a inner part is white, like marrow, and is called themedullary portion. There are two great divisions of the brain; the larger,which is also the up
Outlines of human physiology; designed for the use of the higher classes in common schools . of the brain was made to conformto the skull, though in fact there is no doubt that thebrain gives the form to the bone. On its outer surface,it is of an ash color: this has hence been called thecineritious portion, and, from its position, it has beenknown under the name of the cortical part, as if itformed a covering to the whole, like the bark of a inner part is white, like marrow, and is called themedullary portion. There are two great divisions of the brain; the larger,which is also the upper and front part, is called the ce-rebrum ; the other, which occupies the back and lowerpart of the skull, is called cerebellum. Both of theseare divided to a considerable extent into two parts, onthe right and left, called hemispheres. The hemispheres12 134 NERVOUS SYSTEM. are separated by a strong, membranous partition orseptum. The brain has three membranes. One, which closelyadheres to it, is of a texture so delicate, that it cannotbe separated from it. The middle one has but litde. The upper surface of the Brain. firmness; but in some parts, it is so loosely attached,that it can be examined much better than the outer one, which is next to the skull, is a strong,elastic membrane, and affords great protection to the NERVOUS SYSTEM. 136 brain. There are four cavities within the substance ofthe brain, the precise use of which is not have supposed that they were formed for thepurpose of allowing more space for the life, a serous exhalation is constantly going onin their interior, and in health, this fluid is probably ab-sorbed nearly as fast as it is secreted. But it some-times happens, in a diseased state of the organ, thatthis exhaled fluid accumulates and produces that formi-dable disease, known by the name of internal dropsy ofthe brain, The cerebellum or smaller brain, is covered by avery firm membrane, which separates it from th
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