. A text-book of human physiology . racentrallohule. Within this zone the areas for lateral movements of the head andeyes are located in the posterior part of the second frontal convolution; theface musculature is represented in the lower part of the anterior central eon-volution, the muscles of the upper extremity in the middle part, and thoseof the lower extremity in the upper part. The paracentral lobule in eachhemisphere (Fig. 290) seems to be associated with both opposite the cortical area for the upper extremity is found the area for themusculature of the trunk. It is p
. A text-book of human physiology . racentrallohule. Within this zone the areas for lateral movements of the head andeyes are located in the posterior part of the second frontal convolution; theface musculature is represented in the lower part of the anterior central eon-volution, the muscles of the upper extremity in the middle part, and thoseof the lower extremity in the upper part. The paracentral lobule in eachhemisphere (Fig. 290) seems to be associated with both opposite the cortical area for the upper extremity is found the area for themusculature of the trunk. It is probably not too much to suppose that the smaller areas within eachof these larger areas have the same general arrangement as have those ofthe apes. THE MOTOR AREAS 639 Moreover, it is found in these stimulation experiments on man that, justas in the manlike apes, the locolization is very sharp, that the movementsindeed are confined to single groups of muscles, and that l)etween the excitablepoints are regions which are Fig. 289.—Diagram of the external surface of the left cerebral hemisphere of man, after Ecker.
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