part of has fasciculating neuron projection develops from larval prothoracic posterior intermediate commissure adult posterior intermediate commissure adult prothoracic anterior posterior intermediate commissure 2021-01-11T13:20:52Z VFB:FBbt_00048157 prothoracic aPI fly_anatomy.ontology ProNm aPI Commissure of the adult prothoracic neuromere that is derived from the larval prothoracic posterior intermediate commissure and is formed by hemilineage 5B neurons (Court et al., 2020). It is the most anterior of the adult posterior intermediate commissures in this neuromere (Court et al., 2020). FBbt:00048157 lineage 5 secondary neuron adult prothoracic neuromere