question: What do nerve-associated peripheral glial progenitors give rise to?
answer: Nerve-associated peripheral glial progenitors give rise to parasympathetic neurons. The parasympathetic system in mice--including trunk ganglia and the cranial ciliary, pterygopalatine, lingual, submandibular, and otic ganglia--arise from glial cells in nerves, not neural crest cells. The parasympathetic fate is induced in nerve-associated Schwann cell precursors at distal peripheral sites.