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Fig. 2. Dorsoventral distinctions in axon position. (A) Transverse section of a wild-type ventral nerve cord labeled with Fas II antibody. Fascicle nomenclature according to Landgraf et al. (Landgraf et al., 2003). Dorsal is up in this and all other transverse sections. (B-E) FLP-out analysis of da neuron axon position along the DV axis. Top are dorsal views, bottom are transverse sections. Sections correspond to the location of the yellow lines. Note the position of the dbd terminal next to the DM fascicle (arrowheads in D and E). (B) The terminations of vpda and ddaE, both class I neurons, are likewise immediately next to the DM fascicle. (C) The class II neuron ddaB terminates in ventral neuropil next to VMv (arrow) and forms a collateral branch at VL (arrowhead). (D) The class III neuron v'pda terminates ventrally, adjacent to VMv (arrows). Notice that the dbd neuron next to DM (arrowheads). (E) The class IV neuron, vdaB, terminates ventrally, immediately next to VMv (arrows). (F) Schematic drawing of one half of a CNS section as in A, showing the positions of major fascicles and the approximate locations of da axons (green). Arrow indicates distinct lateral branch of class II neurons. Arrowheads indicate the midline. Genotypes: hsFLP/+; Gal4^109(2)80/+; UAS>CD2>mCD8::GFP/+. Scale bar: 25 µm. C, central; D, dorsal; I, intermediate; L, lateral; M, median; V, ventral.

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