part of fasciculates with presumptive embryonic/larval nervous system larval neuron segmental nerve pioneer neuron FBbt:00001450 fly_anatomy.ontology VFB:FBbt_00001450 SN-pioneer SNp Neuron that, along with one or two other neurons, pioneers the segmental nerve. The cell bodies of this cluster of 2-3 neurons are located posterior and slightly more lateral than the aCC and pCC neurons. larval segmental nerve pioneer neuron