. Kirkes' handbook of physiology . Fig. Fig. 408. Figs. 407 and 408.—Brain of Dog, Viewed from Above and in Profile. F, Frontal fissure some-times termed crucial sulcus, corresponding to the fissure of Rolando in man; 5, fissure of Sylvius,around which the four longitudinal convolutions are concentrically arranged; 1, flexion of headon the neck, in the median line; 2, flexion of head on the neck, with rotation toward the side of thestimulus; 3, 4, flexion and extension of anterior limb; 5, 6, flexion and extension of posteriorlimb; 7, 8, 9, contraction of orbicularis oculi and the facial
. Kirkes' handbook of physiology . Fig. Fig. 408. Figs. 407 and 408.—Brain of Dog, Viewed from Above and in Profile. F, Frontal fissure some-times termed crucial sulcus, corresponding to the fissure of Rolando in man; 5, fissure of Sylvius,around which the four longitudinal convolutions are concentrically arranged; 1, flexion of headon the neck, in the median line; 2, flexion of head on the neck, with rotation toward the side of thestimulus; 3, 4, flexion and extension of anterior limb; 5, 6, flexion and extension of posteriorlimb; 7, 8, 9, contraction of orbicularis oculi and the facial muscles in general. The unshaded partis that exposed by opening the skull. (Dalton.) The fundamental phenomena observed in all these cases may be thusepitomized: 1. Excitation of the same spot on the cortex is always followed by the samemovement in the same animal. 2. The area of excitability for any given MOTOR FUNCTION OF THE CEREBRAL CORTEX 579 movement is extremely small, and admits of very accurate definition. 3. Indifferent animals
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