Abstract

One chordotonal organ innervated by 2 bipolar neurons is found in each labellar lobe of the mosquito Culiseta inornata. Each chordotonal organ is connected by an attachment cell to the distal apex of each labellum. The axons of the chordotonal neurons form the core around which the sensory axons of chemosensory hairs coalesce to form the labial nerve. Nine pairs of neurotubules are found in the distal or ciliary segment of the dendrites. The proximal portion of the dendrites contains the ciliary collar, basal body and axial filament. The axial filament extends proximally to the nerve cell body and lies parallel with the nucleus. The chordotonal organs may act as proprioceptors sensing the amount of spreading of the labellar lobes during feeding.

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