Fig. 8.
Schematic diagrams summarizing the results of the different types of protocols used in the experiments reported here. In each case, the circled sign indicates a reduction (−) or an increase (+) in the arbor of the experimental AP neuron.A, Cutting both roots or ablating both lateral projections (−) leads to increased growth of longitudinal projections (+). B, Cutting the posterior nerve root (−) causes additional growth of both longitudinal projections (+), but neither of these grows sufficiently to exit to the periphery through the next ganglia. C, Ablating the PD cell (X) that serves as a template reduces the dorsal arborization of the AP neuron (−) and increases the growth of its posterior longitudinal projection (+). D, Ablating ipsilateral homologs (X) results in enhanced growth of the longitudinal projections of an AP cell (+), but a diminution of its lateral arborization (−).