Fig. 5.

Organisation of individual ventral nerve cords in Onychophora as revealed by different neuronal markers: retrograde fills (a), DNA labelling (b), antiserum against synapsin (c) and GABA (d). Maximum projection confocal micrographs of Euperipatoides rowelli. Median is left. Asterisks indicate that the distribution of somata is significantly different from uniform (χ² *, **, ***, ****, p < 0.05, 0.01, 0.001, 0.0001 respectively; n.s. not significant; see Table 1 for more details). Dotted brackets indicate leg-bearing regions characterised by the position of leg nerves. a Note that the somata of neurons associated with leg nerves are grouped near their bases (original data from Mayer et al. [3], creative common license of BMC Evol Biol). d Note also the condensed groups of neuronal cell bodies labelled against the neuropeptide GABA that are also located near the bases of leg nerves. Scale bars: 200 μm