Figure 4.

Synaptic connections among corticostriatal pyramidal cells. A1, Reconstructions of the dendrites of presynaptic (gray) and postsynaptic (black) CCS cells and the axon of the presynaptic CCS cell (red). Inset, A presynaptic action potential (top trace) generates a unitary postsynaptic current (bottom trace). A2, Reconstructions and postsynaptic current of a presynaptic CCS cell (gray) and postsynaptic CPn (black) cells. B, Connection probability between pyramidal cell subtypes. Note that very few connections were found from CPn to CCS cells.