lobe system of mushroom body VFB:FBbt_00003688 lobe of mushroom body fly_anatomy.ontology FBbt:00003688 The mushroom body lobe system consists of a vertical (dorsal) branch and a medial branch. In the larva, there are only two lobes (one dorsal, one medial), but remodeling during the pupal stage results in five lobes (two dorsal, three medial) in the adult (Lee et al., 1999). lobe of corpora pedunculata synaptic neuropil domain mushroom body neuropil subdivision