part of larval ventral nerve cord commissure larval posterior commissure larval abdominal posterior commissure Posterior-most of the two main midline-crossing commissures that develop in the posterior half of each abdominal neuromere, except for a9 which only has an anterior commissure. The posterior commissure contains fewer fibers than the anterior commissure and is located approximately at the level of the posterior neuromere boundary. FBbt:00001125 fly_anatomy.ontology VFB:FBbt_00001125 larval abdominal neuromere