The completely undifferentiated cells of the sympathetic nervous system. ... Origin: sympatho-+ G. Gone, seed ... (05 Mar 2000) ... 
(sim″pә-tho-go´ne-ә) sing. sympathogo´nium undifferentiated embryonic cells that develop into sympathetic nerve cells.
Type: Term Pronunciation: sim′pă-thō-gō′nē-ă Definitions: 1. The completely undifferentiated cells of the sympathetic nervous system.
sympathogonia (pl) Primitive cells of the sympathetic nervous system derived from neuroblasts of the neural crest. They have dense nuclei, rich in chromatin, and only a thin rim of cytoplasm, and differentiate to form along one line ganglion cells and along another line chromaffin cells.