Figure 8.

A, Summary of the connectivity in the locomotor network, to include the connections identified here. Open circles indicate excitatory glutamatergic connections, and filled circles indicate inhibitory glycinergic connections. Mixed symbols shows interneuron inputs that can be either inhibitory or excitatory. Only connections that have been verified experimentally are shown. Bi, Diagram showing how different functional assemblies could result from anatomically fixed connections made by individual cells in the EIN pool. Bii, Diagram showing how assemblies could form from a pool of EINs with common synaptic connections. The solid lines show the cells and connections that would be selected to evoke the functional assemblies shown here. The traces in the center show examples of the different feedforward effects identified here. E, Excitatory inputs; I, inhibitory inputs; CCIN, crossed caudal interneuron; MN, motor neuron.