part of adult central complex chiasma commissure anterior chiasma of the central complex 2013-10-10T19:50:53Z FBbt:00110651 ACH Chiasma that lies on the midline between the fan-shaped body (FB) and ellipsoid body (EB) (Ito et al., 2014). Some fibers from one side of the FB project to the contralateral side of the lateral accessory lobe and EB (Ito et al., 2014). FBapl anterior plexus of fan-shaped body fly_anatomy.ontology anterior chiasm of the central complex VFB:FBbt_00110651