Figure 2. Location of synaptic contacts in connections between pairs of layer 4 spiny stellate cells and layer 5 pyramidal cells.

Left panels, presynaptic spiny stellate cell (top) and pyramidal cell in layer 5 (bottom). The cortical layer (L) is given on the left. The barrel structure is indicated by light grey shading. Dendritic arbor is red, axon arbor is blue. Right panels, axon of presynaptic (blue) and dendritic arbor of postsynaptic neurone (black) of a pair of spiny stellate cells (top) and a pair of layer 5 pyramidal cells (bottom), respectively. Blue circles indicate synaptic contacts between the presynaptic axon and the postsynaptic dendrites. Scale bar: 50 μm for top panels, 100 μm for bottom panels.