part of has fasciculating neuron projection develops from larval metathoracic posterior intermediate commissure adult posterior intermediate commissure adult metathoracic posterior posterior intermediate anterior commissure 2021-01-11T14:01:52Z metathoracic pPIa VFB:FBbt_00047570 fly_anatomy.ontology FBbt:00047570 MetaNm pPIa Commissure of the adult metathoracic neuromere that is derived from the larval metathoracic posterior intermediate commissure (Court et al., 2020). It is formed by hemilineage 6B neurites, which cross the midline slightly anterior to the posterior posterior intermediate posterior commissure (Court et al., 2020). It is slightly posterior and ventral to the metathoracic anterior posterior intermediate commissure (Court et al., 2020). hemilineage 6B secondary neuron adult metathoracic neuromere