Identifier: physiologybioche00macl (find matches)
Title: Physiology and biochemistry in modern medicine
Year: 1918 (1910s)
Authors: Macleod, John James Rickard, 1876-1935 Pearce, R. G. (Roy Gentry), 1884-
Subjects: Physiology Biochemistry
Publisher: St. Louis : Mosby
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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V A k Yisuosensory / TTTTTT ^ >> 1 ► > l*Y I «^7 Visuopsychic Fig. 220.—Three sections through different parts of the cerebral cortex. For description seecontent. (Redrawn from Starling.) the cerebral cortex leaves yet uncharted those vast areas lying betweenthem which do not respond in any definite way to artificial stimulation,and the ablation of which results only in more or less indefinite symp- CEREBRAL LOCALIZATION 853 loins, in order to discover the exad Function of these areas, it has beennecessary to employ an entirely different method—that of histologicand embryologic examination. When the patterns of the gray cortexare compared with the habits of the animals, in different groups ofanimals (phylogenetie study), or even in different individuals of the
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Fig. 221.—The location of the chief motor and sensory areas on the outer (A) and mesial (S)aspects of the human brain, as determined by the microscopic structure of the cortex. Thesemaps are only approximately accurate, but they indicate in a general way how the cortex isstructurally composed. (From Starling after Campbell.) same group (ontogenetic study), much useful knowledge concerningcerebral localization can also be gained. In the human animal muchprogress is being made by comparing the structural pattern of the cor- 854 THE CENTRAL NERVOUS SYSTEM tex in different parts of the normal brain with that found in the brainof psychopathic individuals whose mental symptoms have heen care-fully studied before death.* For the purpose of this work it is necessary to recognize severallaminae or layers of nerve colls and nerve fibers composing the cortex.The most practical division is represented in Fig. 220, and is as follows:(1) a narrow superficial layer of nerve fibers, with a few scat

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