Fig. 3

Antidromic spikes and R-IPSPs of abdominal motoneurons. a Antidromic spikes (i) and response to short interval double stimuli (ii) and after hyperpolarization (iii). b R-IPSPs following stimulation of the EO nerve at an intensity just below the threshold for activation of antidromic spikes in the impaled motoneuron (average values). The broken line indicates the extracellular recording from the impaled motoneuron. c Intracellular recordings from Renshaw cells following the application of different stimulus intensities to the L2 nerve (L2 abdominal medial and lateral branches). The bottom line indicates the extracellular field potential just outside of the impaled cell. R-IPSP recurrent inhibitory postsynaptic potential