Electro-physiology electrophysiolog02bied Year: 1896-98 FIG. 165.—Contraction curves of adductor muscle (upper) and abductor muscle (lower) in the cray- fish claw, excited from the common nerve with increasing strength of tetanising induction currents. The figures mark the distance of coil in centimetres. any sign of response. There is always a given strength of excitation at which the contraction of both abductors and adductors is very feeble, but the stimulation is never wholly ineffective. In such a case a slight alteration of the secondary coil in one or the other direction suffices to e
Electro-physiology electrophysiolog02bied Year: 1896-98 FIG. 165.—Contraction curves of adductor muscle (upper) and abductor muscle (lower) in the cray- fish claw, excited from the common nerve with increasing strength of tetanising induction currents. The figures mark the distance of coil in centimetres. any sign of response. There is always a given strength of excitation at which the contraction of both abductors and adductors is very feeble, but the stimulation is never wholly ineffective. In such a case a slight alteration of the secondary coil in one or the other direction suffices to elicit maximal contractions from either adductors or abductors. In order to ascertain the presence or absence of a ' neutral FIG. 166.—Contraction curves with indirect, tetanising excitation of adductor (upper) and abductor (lower) muscles of crayfish claw, with gradual approximation of secondary coil. zone,' it is convenient to excite the nerve continuously, while steadily pushing up the coil. The abductor muscle is first to
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