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Fig. 1. Pharyngeal sense organs in third instar larvae (A,B,G-J) and adults (C-F,K-N) of D. melanogaster, as shown by the P[GAL4] driver line MJ94, expressed in all pharyngeal neurons (all panels except H,L) and the pros^V1 line, which labels subsets of accessory cells (H,L). Expression patterns are shown by the reporters lacZ (A-F: blue) or mCD8-GFP (G-N: green). Neuronal nuclei in G-N are labeled with anti-Elav antibody (red). (A) The larval pharynx is equipped with a dorsal and a ventral pharyngeal sense organ located behind the mouth-hooks (dps, vps), and a smaller sense organ far more posterior (pps), in a region characterized by cuticular ridges (ri). Additional expression is seen in Bolwig's organ (bo), in the presumed dorsal pharyngeal organ (dpo) and in the dorsal and terminal organs (do, to). (B) The pps is composed of an anterior and a posterior sensillum (a, p). (C) The adult pharynx comprises the dorsal and ventral cibarial sense organs (dcso, vcso) and the labral sense organ (lso). MJ94 drives expression also in maxillary palp sensilla (ms) and in labial palp taste bristles (tb). Higher magnifications reveal an anterior and a posterior sensillum in the dcso (D: a, p), three sensilla in the vcso (E: 1-3) and nine sensilla in the lso (F: 1-9; opposite lso shown on top). Label occurs also in the neurons of the fishtrap bristles (E: ftb). Both the larval pps (G,H) and the adult dcso (K,L) are composed of two sensilla (G,K: arrows) of three neurons each. In both sense organs, pros^V1 labels two accessory cells (H,L: arrowheads). The larval dps (I) and vps (J) contain 17-18 and 16 neurons, respectively. The dps is accompanied further back by the dorsal pharyngeal organ (I: dpo). (M) In the adult, the vcso includes three sensilla (1-3) comprising eight neurons (between arrowheads). The vcso is accompanied by two rows of mononeuronal fishtrap bristles (ftb) and by a few extra neurons (arrows). (N) The nine sensilla of the lso contain a total of 18 neurons. (A,B,F,G) Lateral view, distal to the left. (C-E,H-N) Frontal view, distal to the bottom. Scale bars, 100 µm (A,C), 50 µm (N), 40 µm (D-F), 20 µm (B,G-M)

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