Identifier: textbookofphysio1916howe (find matches)
Title: A text-book of physiology : for medical students and physicians
Year: 1916 (1910s)
Authors: Howell, William H. (William Henry), 1860-1945
Subjects: Physiology Medicine
Publisher: Philadelphia and London : W. B. Saunders Company
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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city to evoke a psychical reaction. The Auditory Center.—The location of the auditory area hasbeen investigated along lines similar to those used for the visualcenter. The experimental physiological work has yielded varyingresults in the hands of different observers. Munk and Ferrierplaced the cortical center for hearing in the temporal lobe, and SENSE AREAS AND ASSOCIATION AREAS. 213 in spite of negative results by Schafer and others this localizationhas been shown to be substantially correct. Entire ablation ofboth temporal lobes is followed by complete deafness. Ablationon one side, however, is followed only by impairment of hearing,and in the light of the results from histology and from the clinicalside it seems probable that the connections of the auditory cortexwith the ear follow the general schema of the optical system ratherthan that of the body senses. That is, it is probable that the Posterior nucleus. Deiterss nucleus. Dorsal nucleus.Ventral nucleus. — Cochlear branch.
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Vestibular branch. Semicircularcanals. Scarpas gangliou.Cochlea.Spiral ganglion.Fig. 94.—The medullary nuclei of the eighth nerve.—(From Poireer and Charpy.) auditory fibers from each ear end partly on the same side andpartly or mainly on the opposite side of the cerebrum. The exactportion of the temporal lobe that serves as the cortical terminusof the auditory tract of fibers cannot be determined with certainty,but it seems probable that it lies mainly in the superior temporalgyrus and the transverse gyri extending from this into the lateralfissure of the cerebrum (fissure of Sylvius). The Histological Evidences.—On the histological side the pathsof the auditory fibers have been followed with a large measure ofsuccess, although in many details the opinions of the differ-ent investigators vary considerably. The eighth cranial nerve 214 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. springs from the bulb by two roots: the external and theinternal. The former has been shown to supply, main

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