part of adult antennal lobe synaptic neuropil subdomain antennal lobe hub VFB:FBbt_00100362 fly_anatomy.ontology ALH FBbt:00100362 Central, non-glomerular region of the adult antennal lobe. It is distinguished from the antennal lobe glomeruli in that olfactory receptor neurons do not terminate here, though antennal lobe projection neurons and many local neurons run through this area. The density of synapses is lower than in the antennal lobe glomeruli.