Afferents from M1 and all thalamic nuclei examined, except the PF, formed significantly more axo-spinous synapses than axo-dendritic synapses (*,p<0.05), whereas axon terminals arising from the PF preferentially innervated dendritic shafts (*, p<0.05). Excluding the PF, the percentage of terminals from various thalamic nuclei forming axo-spinous synapses did not differ significantly from corticostriatal afferents (p>0.05). These data were gathered from the examination of both patch and matrix compartments. n=number of terminals. Error bars are SEM.