part of lobe system of mushroom body synaptic neuropil layer mushroom body layer 2018-06-21T10:03:17Z VFB:FBbt_00047311 FBbt:00047311 Division of a mushroom body lobe along the width of the mushroom body lobe system. Layers of the horizontal lobe are regions along the vertical axis and layers of the vertical lobe are regions along the horizontal axis. fly_anatomy.ontology mushroom body neuropil subdivision