Our previous work in the true crab Neohelice granulata revealed both neuroanatomical and, for the first time, functional evidence of a mushroom body (MB) center structurally analogous to those well characterized in insects. Our studies sparked a debate among other authors regarding the distinction between mushroom bodies (MB) and reniform bodies (RB) in true crabs. In the present study, we propose to apply fluorescent dextran tracers to the peduncular tracts of both the MB and the putative RB fascicle, coupling distinct dyes with high-resolution confocal reconstructions to delineate intrinsic neuron cohorts, branching patterns, and efferent projections—directly testing our MB homology hypothesis. In parallel, we propose targeted dextran injections into the lobula neuropil to map visual pathways converging onto calyx- and lobe-like MB domains. Comparative analysis of tracer distributions is expected to resolve tract origins and domain segregation, confirm that the labeled tracts carry MB intrinsic neurons, and reveal how lobula-derived circuits interface with the MB network. Moreover, this approach may enable us to propose potential functions for the RB in crustaceans. Ultimately, this comprehensive anatomical mapping aims to substantiate the presence and architecture of mushroom bodies in true crabs and illuminate the neural substrates underlying higher-order sensory integration within the MB.