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Fig. 2 | BMC Biology

Fig. 2

From: Metamorphic development of the olfactory system in the red flour beetle (Tribolium castaneum, Herbst)

Fig. 2

Development of the antennal chemosensory neurons (CSNs). Volume rendering of the reporter signal in the antenna at different developmental stages in the EF-1-B-DsRed line. A The dashed line depicts the outline of the antenna based on the autofluorescence of the cuticula. In the last larval instar (LL), CSNs innervate the placoid and the distal trichoid sensillum. B, C The neurons retract from the larval antenna during the prepupa (PP), and the somas relocate into the head capsule. D With the onset of metamorphosis, CSNs are found at the distal end of the adult antennae. E–G Their number rises until stage P50% when their gross distribution already resembles that of the adult antenna. Scale bars A–C 25 μm; D–G 100 μm

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