File:Diseases of the nervous system (1910) (14586613667).jpg

Identifier: diseasesofnervou00chur (find matches)
Title: Diseases of the nervous system
Year: 1910 (1910s)
Authors: Church, Archibald, b. 1861, ed Salinger, Julius L. (Julius Lincoln), tr
Subjects: Nervous system
Publisher: New York and London : D. Appleton and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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e most external one, that of the lowerlongitudinal bundle, then the so-called optic radiation of Gratiolet, and, finally,the tapetum of the corpus callosum, which together form the sagittal, medul-lary layer of the occipital lobe; in this restricted space lie tracts of such varyingimportance that the appearance of a center may readily be simulated, andin my opinion this is the origin of Dejerines erroneous conception. To thosemore deeply interested in these anatomical relations I recommend Dejerines Anatomy of the Central Xervous System and my Atlas of Sections ofthe Brain. Fig. 142 is taken from the work of v. Monakow, and shows ahorizontal section through the left hemisphere of the brain at the heightof the first temporal convolution, the third frontal convolution, and the 316 THE SYMPTOM-COMPLEX OF APHASIA splenium of the corpus callosum. The three obliquely shaded areas upon theconvexity show the seat of lesion in motor and sensory aphasia and in pure Motor Aphasia Sensory Aphasia
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Pure Alexia Germ of the^Corpus Callosum Splenium of the//Corpus Callosum Fig. 142. alexia. In contrast to the oblique shading, we observe in the illustration along-stranded fiber mass composed of three bundles; it shows diagrammat- DISTURBANCES OF WRITTEN LANGUAGE 317 ically the above mentioned sagittal medullary portion of the occipital lobeswhich in the hardened preparation is likewise sharply demarcated from themedullary layers of the temporal and lower parietal lobes, as in the illustra-tion. The circular shaded area which is noted in the lower parietal lobe,v. Monakow considers to be the interruption of these three fiber layers whichis a prerequisite for the occurrence of pure alexia, and which, according tohis conception, arises from the destruction of the connecting link between thesensory speech center and the two occipital lobes. As already indicated, I concur in v. Monakows opinion that Dejerinesassumption that the cortex of the angular convolution is the seat of a uni-later

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