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. 2000 Oct 15;20(20):7579–7586. doi: 10.1523/JNEUROSCI.20-20-07579.2000

Fig. 6.

Fig. 6.

Synaptically connected neurons are located in the same barrel. A, An example of a synaptically unconnected pair of excitatory layer 4 neurons, with somata lying in different barrels. The reconstructed axonal (green) and dendritic (black) processes are shown in relationship to the barrel borders (cyan) (A1). The regular firing pattern (A2) and morphology define these cells as excitatory spiny stellate neurons. Action potentials evoked in the left- or the right-hand cell do not evoke responses in the other cell, showing that they are not synaptically connected.B, An example of a connected pair of excitatory layer 4 spiny stellate neurons with soma in the same barrel (B1) with regular firing patterns (B2). The neurons are bidirectionally coupled, such that an action potential in either neuron evokes an EPSP in the other (B3). Scale bars:A1,B1, 100 μm. Calibration:A2,B2, 50 mV, 100 msec; A3, B3, 50 mV (top trace) or 1 mV (bottom trace), 10 msec.