An American text-book of physiology . rrangements within the cortex bywhich any group of muscles can be made to respond to stimuli arriving at anysensory area, we shall follow out the distribution of those cortical cells thestimulation of which causes contractions of the skeletal muscles. The results here presented were obtained from the electrical stimulation ofthe monkeys brain by Beevor and Horsley^ (see Figs. 184, 185). Theseexperimenters explored the exposed surface of the hemisphere with the elec-trodes, moving them two millimeters at a time, and at each point noting themuscle-group firs
An American text-book of physiology . rrangements within the cortex bywhich any group of muscles can be made to respond to stimuli arriving at anysensory area, we shall follow out the distribution of those cortical cells thestimulation of which causes contractions of the skeletal muscles. The results here presented were obtained from the electrical stimulation ofthe monkeys brain by Beevor and Horsley^ (see Figs. 184, 185). Theseexperimenters explored the exposed surface of the hemisphere with the elec-trodes, moving them two millimeters at a time, and at each point noting themuscle-group first thrown into contraction. As the result of many observations on the monkey, it is possible to map outthe cerebral cortex in the following way: The surface of the hemispheres isdivided into regions (motor and sensory regions), which are the largest sub- The Functions of the Brain, 1876. * Proceedings of the Royal Society, London, 1888, vol. xliii. ^Philosophical Transactions of the Royal Society, 1888-90. CENTRAL NERVOUS SYSTEM. (J85. Fig. 184.—Brain of the macaque monkey, showing the sensory and motor areas. In the sensory regionthe name of the sensation is over the locality most closely associated with the corresponding sense-organ;in the motor region the name of the part is written over the portion of the cortex which controls it. Theupper figure gives a lateral view of the hemisphere, and the lower a dorsal view (Beevor and Horsley). divisions. These are subdivided into areas for the muscle-groups belongingto different members of the body—arms, head, trunk, etc., or those areas PoF.
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