part of metathoracic femoral chordotonal organ fly_anatomy.ontology VFB:FBbt_00004438 Chordotonal organ of the adult metathoracic femur. There are three chordotonal organs, located in the ventral chamber near the longitudinal septum. There is on large group, on the ventrolateral side, and two smaller ones in the center of the femur. FBbt:00004438 metathoracic femur chordotonal organ femoral chordotonal organ