. A treatise on nervous and mental diseases, for students and practitioners of medicine. similar word, whichhas led to much confusion—hemianopsia, from ■ij/uavq, half, av (for ava) each,and oipir, sight, meaning also half sight. It seems to be agreed at the presentday that by arbitrary custom hemiopia shall mean the condition of the retina,while lieinianopsia shall be applied to the crossing of the rays of light in the mediain front of the retina. Thus a left hemAopia will indicate that the left halves ofboth retinte are blind, so that the patient, not being able to see objects to the rightof
. A treatise on nervous and mental diseases, for students and practitioners of medicine. similar word, whichhas led to much confusion—hemianopsia, from ■ij/uavq, half, av (for ava) each,and oipir, sight, meaning also half sight. It seems to be agreed at the presentday that by arbitrary custom hemiopia shall mean the condition of the retina,while lieinianopsia shall be applied to the crossing of the rays of light in the mediain front of the retina. Thus a left hemAopia will indicate that the left halves ofboth retinte are blind, so that the patient, not being able to see objects to the rightof either eye, shall be said to have a right hemianopsia. This is made plain bythe diagram of Fig. 28. 28 INTRODUCTORY, regard to the exact cortical localizatioa of the senses of pain, temper-ature, muscular sense, and touch. It will thus be seen that our knowledge of the centres of thecortex is remarkable when we consider that almost the whole workof discovery and confirmation has been done since 1870. Fig. 10represents the centres that are known as we have been describing Fig. 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
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