fasciculates with develops from neuroblast NB3-2 lineage NB3-2 primary motor neuron larval NB3-2 segmental nerve primary motor neuron fly_anatomy.ontology VFB:FBbt_00001548 3-2Ms FBbt:00001548 Larval primary motor neuron that develops from neuroblast NB3-2 and fasciculates with the segmental nerve (Bossing et al., 1996). These neurons collectively innervate one muscle of the VO group and two muscles of the LT group (Bossing et al., 1996). larval segmental nerve motor neuron embryonic/larval motor neuron