part of synaptic neuropil subdomain posterior slope inferior posterior slope FBbt:00045046 Inferior (ventral) part of the posterior slope. It flanks both sides of the esophagus, and is posterior and medial to the wedge. Below the plane of the inferior VLP commissure and the posterior optic commissure. The IPS corresponds to part of the psl of Otsuna and Ito (2006) and to the ventral postcommissural ventromedial cerebrum (Ito et al., 2014). IPS VMCpov ventral postcommissural VMC psl VFB:FBbt_00045046 fly_anatomy.ontology