A text-book of physiology, for medical students and physicians . olando and followsthe order of the cranial and spinal nerves. Within each areasmaller centers may be located by careful stimulation; thus,the hand and arm area may be subdivided into centers for thewrist, fingers, thumb, etc. More recently Sherrington and13 194 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. Greenbaum,* making use of electrical stimulation, unipolarmethod, have explored carefully the motor areas in the state that these areas do not extend back of the centralsulcus, but lie chiefly along the anterior central con
A text-book of physiology, for medical students and physicians . olando and followsthe order of the cranial and spinal nerves. Within each areasmaller centers may be located by careful stimulation; thus,the hand and arm area may be subdivided into centers for thewrist, fingers, thumb, etc. More recently Sherrington and13 194 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. Greenbaum,* making use of electrical stimulation, unipolarmethod, have explored carefully the motor areas in the state that these areas do not extend back of the centralsulcus, but lie chiefly along the anterior central convolution,as represented in Figs. S6 and 87, extending for only a smalldistance on to the mesial surface of the cerebrum. The areathus delimited by physiological experiments is the regionfrom which arises the pyramidal system of fibers, and clin-ical experience has shown that lesions in this part of the cortexare accompanied by a paralysis of the muscles on the other Sale. CenCrvl. AntJS, * Vagina. Sulacalloso \ ^ * Sulccalcarin del. Fit;. 87.—To show extension of motor areas on to the mesial .surface, brain of chim-panzee. [Sherrington and Greenbaum). Mesial surface of left hemisphere: Stippled regionmarked I, K (J gives the motor area for lower limb; /, «, and h .indicate regions from whichmovements were obtained occasionally with strong stimuli; /, foot ami leg; «, shoulder andchest; A, thumb and lingers. I he shaded area marked 10 Y K S indicates a region stimulationof which give- conjugate movements of the eyes. side, particularly in the limbs. Pathological or experimentallesions here, moreover, are followed by a degeneration of thepyramidal neurons,—a degeneration which extends to the of the neurons in the cord. With these data, we can con-struct ;i fairly complete account of the mechanism of voluntarymovements. The Initial outgoing or efferent impulses arise in the large pyramidal cells of the moto
Size: 1962px × 1273px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookautho, bookcentury1900, bookdecade1900, booksubjectphysiology
