Figure 2. Experimental setup and recordings from presynaptic and postsynaptic neurons during the delivery of a single tetanus. A, A suction electrode was applied to the DP nerve to co-tetanize the dorsal P- and T-cells (highlighted) selectively without activating the other T- and P-cells in the ganglion (shaded) that do not have processes in the DP nerve. The subscripts represent lateral (L), ventral (V), and dorsal (D) and indicate receptive fields in the skin that each sensory neuron innervates. B, Sample recordings from the dorsal P- and T-cells, from the postsynaptic S-cell, and from an N-cell and a Retzius cell (which also have processes in the DP nerve) during delivery of a single tetanus.