Fig. 4. Postsynaptic effects of femoral and tibial campaniform sensilla (CS) on the activity of the motoneurons of muscle M103d. (A) Spikes of a CS (feCS2; lower trace) are followed 1:1 by depolarisations or even spike generation in the fast-depressor motoneuron (upper trace). (B) Averaged data from A: the constant central delay of 2 ms indicates a direct connection. The amplitude of the excitatory postsynaptic potential (EPSP) is approximately 7 mV (signal average of 64 sweeps). (C) Four superimposed sweeps in the slow-depressor motoneuron (upper trace) triggered from a CS afferent (feCS2; recorded at nerve 5bc2). The EPSPs are evoked after a constant central delay of 1.5 ms. (D) Bursts of spikes (large potentials; lower trace) from a CS (tiCS5; recorded in nerve 5B1k) on the dorsal tibia inhibit spike generation in the fast-depressor motoneuron (upper trace).

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