. A practical treatise on medical diagnosis for students and physicians . ortions of the cortex that have to do with thesefunctions. As a result of experimental work and of the repeated ex-amination of pathological specimens a considerable amount of knowledgehas been acquired upon this subject. The motor regions, indeed, havebeen marked out with accuracy, and some of the regions for the recep- CORTICAL LOCALIZATION. .325 tion of impulses from the organs of special sense are also certainly cortex of the brain has been divided into various region- which arereferred to certain fissures
. A practical treatise on medical diagnosis for students and physicians . ortions of the cortex that have to do with thesefunctions. As a result of experimental work and of the repeated ex-amination of pathological specimens a considerable amount of knowledgehas been acquired upon this subject. The motor regions, indeed, havebeen marked out with accuracy, and some of the regions for the recep- CORTICAL LOCALIZATION. .325 tion of impulses from the organs of special sense are also certainly cortex of the brain has been divided into various region- which arereferred to certain fissures which are quite constant in position. The roostimportant of these is the fissure of Sylvius, which separates the temporo-sphenoidal lobe below from the frontal and parietal lobes above. Aroundits posterior extremity winds the convolution known as the gyrus angu-laris. Next is the Rolandic fissure, passing from the superior longi-tudinal fissure to the fissure of Sylvius, with which it forms an acuteangle. It separates the frontal from the parietal lobe, and lies in the. Cortical centres and ar«.-as of representation on the lateral a:-j,;;t <A Uj<; bemicerebn midst of the motor region of the cortex. In front of it is the ascendingfrontal convolution, and behind the ascending parietal convolution. Thesetwo contain nearly all the motor centres. The third prominent fissure isthe occipitoparietal. It is best defined on the median surface of the brain,but can be traced for a short distance on the convex surface. It separatesthe parietal from the occipital lobe. On the median surface it unites atan acute angle with the calcarine fissure, the two enclosing between themthe triangular convolution known a- the cuneus. (See Tig. fJ2 and ) The motor centre-; are so arranged that those for the face are inthe lowest portion of the motor region, those for the arms just abovethem, those for the legs above these, and those for the trunk in the pos-terior termination of the ascendin
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