EGTA and motoneuronal after-potentials.

1. Intracellular iontophoretic injections of EGTA (5--20 nA) into cat spinal motoneurones consistently greatly reduce the amplitude of the delayed after hyperpolarization (a.h.p.) that follows the spike. 2. This effect is accompanied by a large reduction (on average by 3/4) in the marked increase in input conductance normally associated with the a.h.p. 3… (More)