Figure 27

A comparison of the arrangement of neuroblasts and pioneer neurons between the malacostracan crustacean Orchestia cavimana (A, C) and the insect Drosophila melanogaster (B, D). A, B. Scheme of the map of individually identified lateral neuroblasts in both species (midline omitted). Dotted lines mark the segment boundaries. Gray-shaded neuroblasts are engrailed-positive. C, D. Schematic representation of the position and axon pathways of the clones of the homologous neuroblasts b1hn and 1-1 in Orchestia and Drosophila, respectively. The pioneer neurons aCC and pCC (pink) are considered homologous between the two species. Blue neurons and glial cells represent the remaining cells of the respective neuroblast lineage. [Dorsal view.] Abbreviations: 1-1 etc. = labels of individually identified neuroblasts in Drosophila; a1eixn etc. = labels of individually identified neuroblasts in Orchestia; aCC = pioneer neuron (anterior corner cell); acom = anterior commissure; con = connective; gc = glial cell; isn = intersegmental nerve; pCC = pioneer neuron (posterior corner cell); pcom = posterior commissure. sn = segmental nerve. A, B, C: Modified from [142]; D: Modified from [333]. A, B, C, D: With permission of the Royal Society in London.