Human anatomy, including structure and development and practical considerations . quilibrium, etc. This cortical region probably repre-sents a complex mass of sense centres rather than a sinp^le sensory area, and inaddition to bein«i^ a sensory field, the souKesthetic area is the i^rcat niolor rei^ionof the brain. When this sensory-motor area and the various sensory areas are fully taken intoaccount, there still remain about two-thirds of the cortex which appear t(j ha\e noth-injT to do with the peri[)hery. Flechsig calls these ,nons of the cortex associa-tion centres, as he believes they
Human anatomy, including structure and development and practical considerations . quilibrium, etc. This cortical region probably repre-sents a complex mass of sense centres rather than a sinp^le sensory area, and inaddition to bein«i^ a sensory field, the souKesthetic area is the i^rcat niolor rei^ionof the brain. When this sensory-motor area and the various sensory areas are fully taken intoaccount, there still remain about two-thirds of the cortex which appear t(j ha\e noth-injT to do with the peri[)hery. Flechsig calls these ,nons of the cortex associa-tion centres, as he believes they furnish arranj^ements for unitinj^ the various centralsense areas. The best known cortical areas are the motor, speech, visual, and auditory, al-though new contributions to our knowledge are being made from time to time. Re-cently Griinbaum and Sherrington have demonstrated in the cortex of the higherapes, including the orang and several species of the chimpanzee and gorilla, that themotor area was found in the whole length of the precentral convolution and the en- FiG. Left cerebral hemisphere illustrating diagramniatically motor zone and its subdivisions. (Mills.) tire length of the central fissure. It did not at any point extend behind the centralfissure. They demonstrated other important facts in connection with this and otherareas. These results have been in part at least confirmed by recent histological re-searches, and by faradization of the human brain during operation for the purposeof more accurately identifying the relations of the opening to the area to be exposed. The most important, because the best known, area of the cortex, is that asso-ciated with the fissure of Rolando and the fissure of Sylvius. Before the publication of the experiments and observations just alluded to, themotor zone was regarded as extending over both central convolutions which lie oneanterior and the other posterior to the central fissure or fissure of Rolando, also overthe paracent
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