. A treatise on nervous and mental diseases, for students and practitioners of medicine. Diagram of lesion causing loss of tact and pain sense, with preservation of muscular sense (autopsy). them. From this it will be seen that we know fairly well the motorcentres for the arm and leg muscles, for the muscles of the head andface, for articulate speech, for word-deafness, for paraphasia or inter-ruption of speech conduction, for word-blindness, for hemianopsia,and possibly for agraphia; whilst the centre for the muscular sense Fig. 10 WORD-BLINDNESS. SPEECH. Diagram showing localization of centr
. A treatise on nervous and mental diseases, for students and practitioners of medicine. Diagram of lesion causing loss of tact and pain sense, with preservation of muscular sense (autopsy). them. From this it will be seen that we know fairly well the motorcentres for the arm and leg muscles, for the muscles of the head andface, for articulate speech, for word-deafness, for paraphasia or inter-ruption of speech conduction, for word-blindness, for hemianopsia,and possibly for agraphia; whilst the centre for the muscular sense Fig. 10 WORD-BLINDNESS. SPEECH. Diagram showing localization of centres in the cortex. is probably to be found in the ascending parietal convolution, andthe centres for tact and pain are possibly to be found in the parietallobes. There is some dispute, however, as to the exact localizationof the different muscular groups in the motor region. It is veryevident that there is a large portion of the cortex with whose func-tions we are not acquainted. The portion of the two frontal convo- ANATOMY. 29 lutions somewhat in front of the ascending frontal convolutions areinexcitable, and lesions of them do not give rise to motor or sensoryphenomena, but rather to purely mental phenomena, so far as we nowknow. Outside of the regions we have marked, the functions of thecerebrum are unknown to us; it is probable that every year willadd to our knowledge. The doctrine of cerebral localization has beenvigorously opposed by a small and constantly waning school, of whichGoltz is the most illustrious exponent. As critics these
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