. Bulletin of the Massachusetts Department of Mental Diseases . areas. Sections from the second and third frontal gyri onthe left showed loss of myelin in the fibers of the zonal was a slight diminution in the number of cortical cells, andthose present showed considerable chromatolysis. Anas involved by Tumor.—The tumor directly involved bypressure the gray substance and fiber tracts about the thirdventricle, including: — (a) The anterior commissure containing fibers between the twohippocampal regions (pars temporalis), and those derived fromthe lobus olfactorius connecting the olf


. Bulletin of the Massachusetts Department of Mental Diseases . areas. Sections from the second and third frontal gyri onthe left showed loss of myelin in the fibers of the zonal was a slight diminution in the number of cortical cells, andthose present showed considerable chromatolysis. Anas involved by Tumor.—The tumor directly involved bypressure the gray substance and fiber tracts about the thirdventricle, including: — (a) The anterior commissure containing fibers between the twohippocampal regions (pars temporalis), and those derived fromthe lobus olfactorius connecting the olfactory tract on the oneside with the hippocampal region on the opposite side (parsolfactoria). 1 bI The fornix composed of fibers arising in the hippocampalregion, pursuing an arched course to the corpora filters terminate here, others cross the midline and turndownward into the recticular formation as far as the pons. (c) The lamina cinerea and lamina terminalis, a thin layer ofgray substance between the corpus callosum and chiasma, con-. Fig. 2. — Patient, May 10, 1914. Fig. 3. — Papillomatous character of the growth, type of epithelium and connective tissuestroma. Hematoxylin and eosin, X 70.


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