A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . nal geniculate body to tne REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Brain, Physloloey of cerebral cortex. Since the fibers from the nasal partsof tlie retiniB cross at the optic chiasm, we find on oneside the geniculate bodv as a subsidiary station forcorresponding parts of tlie retinae. It is found when the cortex is extirpated and theeve is stimulated bv light, reflex movements are stillpossible, and since tlie impulses may pass to the quad-rigeminal body and t
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . nal geniculate body to tne REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Brain, Physloloey of cerebral cortex. Since the fibers from the nasal partsof tlie retiniB cross at the optic chiasm, we find on oneside the geniculate bodv as a subsidiary station forcorresponding parts of tlie retinae. It is found when the cortex is extirpated and theeve is stimulated bv light, reflex movements are stillpossible, and since tlie impulses may pass to the quad-rigeminal body and thence to the nuclei of the corre-sponding cranial nerves, these movements mayresemble those which are found in normal is probably the condition that led .some of theearlier investigators to doubt tiie cortical localizationof vision in the occipital cortex. Hearing.—The connections of the ear with the cere-brum are complex, many pathways being possible tothe impulses which originate in the cochlea and travelto the cerebral cortex. It is likely that the impulsesstarting from one ear pass entirely to the opposite. vm Fig. 1044.—Scheme of Impulses from Ear to Cerebral Cortexthrough Subsidiary Ganglia. (Stewart, after Lewandowsk>-.)Bq, Bnichia of quadrigeminum; Cq, quadrigeminal commis-sure: G, accessorj nucleus; Gm, corpus genicuiatum medius;H. Helds fibers: Lt, lateral fillet: nL, nucleus of lateral fillet: Os,oliva superior: P, commissure of lateral fillet: <?p. corpus quadri-geminum posterior: R, cerebral cortex; 5p, ganglion spirale; St,striff acustic»: T, tuberculum acusticum; Tr^ trapezium; (r,trapezoid nucleus. hemisphere. The connections are made first throughthe accessory nucleus and the tuberculum acusticum,whence some fibers pass to the superior oliva on theopposite side, while others pass directly, and meetfibers from the superior oliva, into the lateral fibers divide, some going to the inferior corpusquadrigeminum, others by the int
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