Figure 7.

Monosynaptic contribution of the lumbar locomotor network to the synaptic driving of thoracic motoneurons. A, Membrane potential oscillations recorded from a T8 motoneuron during NMA/5-HT-induced locomotor-like activity in the lumbar spinal cord. B, Decreases in amplitude of the locomotor synaptic drive is still observed in the same motoneuron when a solution containing a high concentration of cations is applied to the thoracic segment to depress the polysynaptic pathways. C, The mean synaptic drive computed from the recordings is presented in A and B in normal aCSF (black trace) and in high-cation-containing aCSF (gray trace). r, Right; l, left; T, thoracic; L, lumbar.