Brain and mind; or, Mental science considered in accordance withthe principles of phrenology, and in relation to modern physiology . plan, there is found a great difference inthe number and depth of these convolutions and thequantity of gray substance, and this difference will befound to correspond with the degree of the fact that the extent of this cineritious matterbears a general relation to the intelligence manifested, itis inferred that this portion of the brain is specially con-cerned in the exercise of thought, while the medullarymatter serves chiefly as a medium of co
Brain and mind; or, Mental science considered in accordance withthe principles of phrenology, and in relation to modern physiology . plan, there is found a great difference inthe number and depth of these convolutions and thequantity of gray substance, and this difference will befound to correspond with the degree of the fact that the extent of this cineritious matterbears a general relation to the intelligence manifested, itis inferred that this portion of the brain is specially con-cerned in the exercise of thought, while the medullarymatter serves chiefly as a medium of communication. Cerebrum and Cerebelhnn,—The mass of the brainis constituted of two general parts, the cerebrum andthe cerebellum, or the Gfreat brain and the little brain^ 50 BRAIN AND MIND. which in the adult head bear the relation in point of size ofone to about eight. The cerebellum lies directly underthe posterior portion of the cerebrum, from which it is sep-arated by a strong membrane proceeding from the dura-mater^ called the teiiforiiwt. In some animals these twoparts of the brain are separated by a thin plate of 12.—View of Brain from abovk, showing the Convolutions. The cerebellum has hemispheres, but is not convoluted likethe cerebrum; its surface, however, is traversed by manycurved furrows which vary in depth. The cerebrum andthe cerebellum, as well as all other parts of the brain, areunited by the po?is varolii, a broad mass of fibers mingled STRUCTURE OF BRAIN AND SKULL. 5 i Uith gray matter which lies under and between the hemi-spheres, immediately above the medulla oblongata^ the capi-tal of the spinal column. From the medulla oblongata asa radial point, the medullary fibers proceed to all parts ofthe encephalon, hence this part of the nervous organism isgenerally recognized as the medium of communicationbetween the brain and the body. Hemispheres.—The cerebrum is divided into two equalportions, called the right and left hemispheres, by the fal-cifor
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphrenology, bookyear1
