Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . right-handed subjects the left hemisphere, and in left-handed subjects the righthemisphere, seems to monopolize the function of sound-interpretation to the speech centre. GENERAL DEDUCTIONS RELATIVE TO APHASIA. 67 ciating tracts of fibres between the areas of hearing or sight and themotor speech centre of Broca (Wernicke). 5. The condition of imperfect speech, termed anarthria,^ is pro-duced by a lesion of the medulla, which i
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . right-handed subjects the left hemisphere, and in left-handed subjects the righthemisphere, seems to monopolize the function of sound-interpretation to the speech centre. GENERAL DEDUCTIONS RELATIVE TO APHASIA. 67 ciating tracts of fibres between the areas of hearing or sight and themotor speech centre of Broca (Wernicke). 5. The condition of imperfect speech, termed anarthria,^ is pro-duced by a lesion of the medulla, which interferes with the functions ofthe nuclei of the cranial nerves associated with speech. It is occasionallyobserved in connection with focal lesions of the floor of the fourth ven-tricle. These cases are to be differentiated from aphasia of cortical originby the co-existence of other symptoms produced by the medullary lesion(see sul)sequent page). 6. In order to properly pronounce any word, it is essential thatboth the cortical centre of speech, and also the nuclei of the medulla,which are associated with it, must be called into action. /^(^^mr/JES OF^~^~^^ SIGHT. TH£ SO-CALLED \ BPSEDll TRACT JVUCLEI OF ORIGIN OF NBBVKS mPLOYED JN SPEECH Fig. 24.—A Diagram Designed by the Author to Illustrate the Mechanism of theApparatus Required in Speech.—The reader must not regard this diagram as intendedto accurately portray the anatomical relations of the various centres and tracts to each other. 7. The peculiar course which the fibres of the speech tracV takewithin the cerebral hemisphere, sheds light upon those reported cases ofaphasia where the lesion was situated posterior to the centre of Broca,These fibres run from the third frontal gyrus close to the surface of thehemisphere, and in an antero-posterior direction (passing in the externalcapsule) to reach the posterior part of the lenticular nucleus. They dipat this point into the posterior part of the internal capsule. They the
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