MEASUREMENT OF EXCITABILITY OF VARIOUS FIBERS IN PERONEUS NERVE IN RABBITS STANDARD ELECTRICAL QUANTITY (a) AS AN ACTUAL INDEX FOR MEASURING EXCITABILITY / 西安交通大学学报(医学版)

Standard electrical quantity (a), chronaxie (?), rheobase (Rh), "b" in Weiss' formula and intensity threshold of duration being 40 ?s and 300 ?s (T_(?) and T_(200)) were measured on peroneus nerves in rabbits. The results show that "a" is an actual index for measuring the excitability of various groups of fibers. The larger fibers, the higher excitability and the smaller "a" values. "b" does not indicate excitability. "?" , "Rh" , "T_(40)" and "T_(200)" are not actual indexes for measuring excitability because they are influenced by "b" in Weiss' formula.

EFFECTS OF TEMPERATURE AND ANESTHESIA ON VARIOUS EXCITABILITY INDEXES OF SCIATIC--PERONEAL NERVE IN TOADS / 西安交通大学学报(医学版)

Effects of temperature and anesthesia on various excitability indexes of sciatic—peronael nerve were observed in toads. The results show that standard electrical quantity(a) changes regularly with the change of excitability. The higher excitability, the less the "a" value. But "b" in Weiss's fomula, chronaxie (Chr), rheobase (Rh), and intensity-duration curve do not indicate excitability. The time constant (RC)of the cell membrane is not related to the changes of excitability. Thus, "a" is an actual index of measuring excitability.