part of has soma location supraesophageal ganglion neuron serotonergic IP neuron FBbt:00001587 VFB:FBbt_00001587 fly_anatomy.ontology Serotonergic neuron whose cell body is located in the inferior protocerebrum (inferior neuropils). There is one cluster per hemisphere, of approximately three of these cells in the larva and six in the adult. serotonergic inferior protocerebrum neuron protocerebrum brain serotonergic neuron