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Fig. 1. Sensory axon morphology is correlated with peripheral dendritic morphology. (A) Schematic representation of the abdominal PNS (magenta box) and sensory axon projections to the CNS (green box). Sensory neurons are arranged in dorsal, lateral, ventral' and ventral clusters. Segments A2-A6 are shown. (B) A representative dorsal view of the ventral nerve cord with sensory axons (large arrowheads) and a few central neurons (small arrowheads) labeled by the MARCM system (left, green box). Schematic of the PNS sensory neurons with dendritic arborization (da) neurons indicated by diamonds (right, magenta box). Classes of each neuron are indicated by color key: class I, green; class II, yellow; class III, tan; class IV, blue. (C) Top: dendritic morphologies of the four distinct classes of da neurons. Class I and II neurons have simple dendrites, with the class I dendrites directed towards the segment border. Class III neurons have numerous short dendritic protrusions extending from their main trunks. Class IV neurons have extensive and highly branched dendrites. Below: individual axon morphologies of the different classes of da neurons. Class II neurons each show collateral branches (arrowheads). Class III neurons (three of five are shown here) have simple axons without collateral branches. Dorsal and ventral class IV neurons cross the midline, and showed elaborate tufts of branches where the axon meets its anteroposterior fascicle. Arrows mark the location of axons relative to the CNS midline. Genotype: tubP-Gal80, hsFLP, FRT19A/yw FRT19A; Gal4^109(2)80, UAS-mCD8::GFP/+. Scale bars: 25 µm (B, axons in C). d, dorsal; l, lateral; v, ventral; v', ventral'.

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