part of has fasciculating neuron projection develops from larval metathoracic posterior intermediate commissure adult posterior intermediate commissure adult metathoracic posterior posterior intermediate posterior commissure 2021-01-11T13:58:14Z fly_anatomy.ontology FBbt:00047571 MetaNm pPIp 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 12B and 23B neurites, which cross the midline slightly posterior to the posterior posterior intermediate anterior commissure (Court et al., 2020). It is slightly posterior and ventral to the metathoracic anterior posterior intermediate commissure (Court et al., 2020). VFB:FBbt_00047571 metathoracic pPIp lineage 23 secondary neuron hemilineage 12B secondary neuron adult metathoracic neuromere