adult ellipsoid body ring neuron adult ellipsoid body extrinsic ring neuron fly_anatomy.ontology VFB:FBbt_00003654 ExR FBbt:00003654 ExR ExR-neuron Ring neuron with extensive arborizations outside of the ellipsoid body (Hanesch et al., 1989; Omoto et al., 2018). Unlike the R-neurons, these neurons do not develop from neuroblast DALv2 (Omoto et al., 2018), and some of these cells are derived from each of BAmv1, DM6, DM4, and DM3 (Kandimalla et al., 2023). There are usually only one or two of each type of extrinsic ring neuron per hemisphere (Hulse et al., 2021). extrinsic ring neuron