supraesophageal commissural pioneer tract anterior ventral commissural pioneer tract VFB:FBbt_00001633 FBbt:00001633 anterior VCT fly_anatomy.ontology One of the supraesophageal commissural pioneer tracts. It is formed by the axons that reach the P2m cluster, follow its outline and reach the dorsal midline where they meet and fasciculate with their contralateral counterparts.