part of synaptic neuropil domain inferior neuropils inferior bridge 2009-08-13T04:53:41Z fly_anatomy.ontology The IB corresponds to part of the superior spsl of Otsuna and Ito (2006). The IB also corresponds to the ventral part of the caudalcentral protocerebrum (CCP) of Chiang et al. (2011) and to part of the posterior inferior protocerebrum (Ito et al., 2014). IPp spsl IB Posterior-most synaptic neuropil domain of the midline. It is the only synaptic neuropil domain outside of the central complex that is fused across the midline. It is located behind the fan-shaped body and below the protocerebral bridge. CCP posterior inferior protocerebrum VFB:FBbt_00040050 FBbt:00040050