Fig. 1. (A–F) Morphology of the descending interneurons that receive antennal mechanosensory input. (A) DBNi1-2 is characterised by its large dendrite (arrow), which ramifies extensively in the ventral antennal mechanosensory part of the deutocerebrum. Another dendrite extends anteriorly into the lateral protocerebrum (arrowhead). The axon (asterisk) projects into the ipsilateral connective. ant., anterior; lat., lateral. (B) Sparse projections of DBNi1-2 in the suboesophageal ganglion (sog). (C) Fan-like projections of DBNi1-2 in a typical intracellular fill (Lucifer Yellow). AL, antennal lobe; N1, flagellar nerve 1. (D) DBNi2-1 ramifies extensively in the deutocerebrum (arrow) dorsal to DBNi1-2. Dense arborizations are present in the medial protocerebrum (arrowhead). (E) The DBNc1-2/c2-2 interneuron descends into the connective contralateral to the soma. The single main dendrite is in the ispilateral deutocerebrum. (F) The contralaterally descending DBNc2-3 interneuron is characterised by a primary neurite devoid of any branchings and a fan-like dendrite in the deutocerebrum. All diagrams are in ventral view.