part of capable of expresses sends synaptic output to region has sensory dendrite in Ir40a antennal lobe glomerulus VP peripheral nervous system hygrosensory neuron adult antennal lobe receptor neuron external sense organ sensory neuron sensillum of sacculus adult hygrosensory neuron Ir40a 2015-01-08T15:46:51Z fly_anatomy.ontology VFB:FBbt_00110990 FBbt:00110990 ionotropic receptor neuron Ir40a ORN sacI Adult hygrosensory neuron that expresses the humidity-sensing Ionotropic receptor (Ir) 40a, and the co-receptors Ir93a and Ir25a, and responds to dry air (Silbering et al., 2011; Enjin et al, 2016; Knecht et al., 2016). There are a few different subtypes, innervating either the antennal lobe VP1d or VP4 glomeruli (Silbering et al., 2011; Marin et al., 2020) and having dendrites in either the basiconic sensilla of chamber I or the blunt-tipped sensilla of chamber II of the sacculus (pore-less sensilla) (Enjin et al., 2016; Marin et al., 2020). Ir40a ORN Ir40a OSN Ir40a adult olfactory receptor neuron Ir40a sensory perception of low humidity detection of low humidity