neuron of aristal sensillum [FBbt_00004186]
Sensory neuron of aristal sensillum. Each sensillum contains a pair of sensory dendrites. The outer segment of these dendrites is encased in an electron-dense dendritic sheath and each of the pair has a distinct morphology: one is short and cylindrical proximally, but flattened distally; the other is larger and has a plasma membrane that form 2 interdigitating spiral whorls of lamellae and has periodically arranged electron dense particles protruding from the plasma membrane into the extracellular space (Foelix et al., 1989). The inner-segments of these dendrites are delimited from the outer segments by a ciliary region and are rich in vesicles, mitochondria and ribosomes. The somata sit in a small ganglion near the base of the arista. The axons project via the aristal nerve, which merges with the antennal nerve, and innervate glomeruli VP2 and/or VP3 of the adult antennal lobe. (Stocker et al., 1983). Innervation pattern of arista sensory neurons determined by cobalt back-fill (Stocker et al., 1983, Stocker et al., 1990). Foelix et al., 1989, suggest that the morphology of the highly lamellated neurons is consistent with a thermosensory function based on the similarity of this morphology to that of thermosensory neurons in the antennae of other insects.
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VFB Term Json
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