part of embryonic stomatogastric nervous system precursor cell of the stomatogastric nervous system fly_anatomy.ontology VFB:FBbt_00001070 FBbt:00001070 Precursor cell of the stomatogastric nervous system of the embryo. These cells can develop by invagination or delamination. There are three distinct populations, iSNSP, dSNSP and tSNSPs, that can be recognized from embryonic stage 10-12. SNSPs developing embryonic structure somatic precursor cell