. A text-book of human physiology . SURVEY -4SG COR The results of Fritsch and Hitzig to which we liaA-e referred on the pre-ceding page were as follows: Xo movements were obtained by stimulation of the posterior part of the cere-bral cortex with weak electric cur-rents. But when the current wasapplied to the anterior part, move-ments appeared on the opposite sideof the body. With a weak stimulusthe effect was confined to certainsharply defined groujis of a stronger stimulus the move-ments appeared also in other groupson the same side (cf. Fig. 282). With rapidly repeated inductio
. A text-book of human physiology . SURVEY -4SG COR The results of Fritsch and Hitzig to which we liaA-e referred on the pre-ceding page were as follows: Xo movements were obtained by stimulation of the posterior part of the cere-bral cortex with weak electric cur-rents. But when the current wasapplied to the anterior part, move-ments appeared on the opposite sideof the body. With a weak stimulusthe effect was confined to certainsharply defined groujis of a stronger stimulus the move-ments appeared also in other groupson the same side (cf. Fig. 282). With rapidly repeated inductionshocks applied to the differentpoints, the appropriate musclescould be thrown into tetanus. Con-tinued for several seconds, this formof stimulus produced a persistenttetanus w-hich might spread to allparts of the body (cortical epilepsy,cf. below, page 641). Tlie first question suggested bythese ol)servations is, what part oftlie cerebrum is the part primarilystimulated by the current—the cor-tex, the underlying white matter, or. Fig. 282.—Dorsal surface of the dogs brain,with the excitation points indicated accordingto Fritsch and Hitzig. a, neck muscles; +,extensors and adductors of the foreleg; +,flexion and rotation of the foreleg; -, hindleg;O, face; Scr, sulcus cruciatus; ASG, anteriorsigmoid gyrus; PSG, posterior sigmoid gyrus;COR, coronary gyrus; cor, coronary fissure;/, //, ///, IV, first to fourth external con-volutions. the deeper parts of the brain?The answer is unanimous, that the cortex represents the immediate pointof attack. The following are among the most important experimental proofsof this proposition: THE MOTOR AREAS 633
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