ellipsoid body outer posterior domain fly_anatomy.ontology ellipsoid body posterior disk EBop The 'posterior ring' of Hanesch et al. (1989) and 'posterior disk' of Renn et al. (1999) appear to refer to EBop and EBip collectively. The 'posterior shell' of Wolff et al. (2015) also refers to EBop and EBip collectively (Omoto et al., 2018). This region was defined (as EBP) by Lin et al. (2013), but no R ring neurons known at the time arborized here. EBr6 FBbt:00007554 VFB:FBbt_00007554 ellipsoid body posterior ring Concentric subdivision of the ellipsoid body that lies posteriorly, distal to the canal (Omoto et al., 2018). It contains the arborization of R6 ring neurons (Omoto et al., 2018). EBP ellipsoid body posterior shell ellipsoid body layer