. Electro-physiology. Electrophysiology. 266 ELECTRO-PHYSIOLOGY CHAP. opened after a short closure, diametrically opposed changes of form will be visible in favourable cases in both halves of the muscle. The anodic half shortens, often in no inconsiderable degree, which must obviously be the expression of the break excitation, while at the same time the kathodic half is more plainly relaxed than would presumably have been the case without the intervention of excitation. On rapidly repeating the stimuli, with uniform direction of current, the same phenomena ap- pear, though in diminishing quant
. Electro-physiology. Electrophysiology. 266 ELECTRO-PHYSIOLOGY CHAP. opened after a short closure, diametrically opposed changes of form will be visible in favourable cases in both halves of the muscle. The anodic half shortens, often in no inconsiderable degree, which must obviously be the expression of the break excitation, while at the same time the kathodic half is more plainly relaxed than would presumably have been the case without the intervention of excitation. On rapidly repeating the stimuli, with uniform direction of current, the same phenomena ap- pear, though in diminishing quantity, as at the beginning of the excitation, for as long a period as the muscle remains in any. Fio. 93.—Sartorius fixed in the middle (double myograph). Persistent veratriii contraction. .S, closure; 0, opening of a constant current. Relaxation occurs at the anodic (A), con- traction at the kathodie (A"), half of the muscle. considerable contraction (Fig. 9o). From this it would seem that we are here concerned essentially with local changes in the muscle, confined to the immediate proximity of the physiological anode or kathode, and not, as in cardiac muscle, extending over a larger area. The changes of form described above in the sartorius, thrown by veratriii into an artificial state " analogous to tonus," present a complete analogy with the consequences of electrical excitation in systolically-contracted cardiac muscle, as above described. Here, too, along with the ordinary effects of polar excitation (which for the rest appear less. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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