Fig. 3.

Endogenous synaptic drive elicits greater excitation in sda motoneurons. A and B: typical current-clamp recordings, in which the membrane voltage was free to change, showing the sustained depolarizations that arise in aCC/RP2 motoneurons due to presynaptic excitatory input (recordings are shown from an aCC motoneuron in this instance). Notably, these depolarisations were slightly larger and significantly longer in duration and fired considerably more action potentials (arrows) in sda motoneurons (B) compared with their WT counterparts (A). Scale bar = 10 mV/100 ms.