part of develops from capable of expresses sends synaptic output throughout has sensory dendrite in Ir40a sensillum of sacculus chamber II eo neuron adult peripheral nervous system adult hygrosensory neuron Ir40a VP1d 2018-06-08T12:27:03Z FBbt:00047226 HRN_VP1d DoOR:Ir40a.VP1 fly_anatomy.ontology Adult hygrosensory neuron that expresses the humidity-sensing Ionotropic receptor (Ir) 40a, and the co-receptors Ir93a and Ir25a, and innervates the antennal lobe glomerulus VP1d (Enjin et al, 2016; Knecht et al., 2016; Marin et al., 2020). It receives sensory input in the blunt-tipped sensilla of chamber II of the sacculus and its projections remain strictly ipsilateral (Silbering et al., 2011; Marin et al., 2020; Schlegel et al., 2021). It is activated by dry air (to a lesser extent than the VP4 Ir40a neurons) (Knecht et al., 2016) and by large decreases in temperature (Enjin et al., 2016), which may collectively correspond to detection of evaporative cooling (Marin et al., 2020). It develops from an Nab precursor (Benton et al., 2025). There are around 7-9 of these cells per hemisphere (Marin et al., 2020). VFB:FBbt_00047226 HRN_VP1d adult olfactory receptor neuron Ir40a VP1 VP1dRN antennal olfactory receptor neuron precursor Nab antennal lobe glomerulus VP1d adult thermosensory neuron adult antennal lobe receptor neuron unilateral antennal lobe receptor neuron adult hygrosensory neuron Ir40a detection of temperature stimulus sensory perception of cold stimulus