part of peripheral nervous system parasympathetic ganglion sympathetic ganglion glial cell satellite glial cell 2014-04-02T10:48:58Z BTO:0005629 BrendaTissueOBO Marion SGC cell Satellite glial cells are the principle glial cells found in the peripheral nervous system, specifically in sensory, sympathetic, and parasympathetic ganglia. They compose the thin cellular sheaths that surround the individual neurons in these ganglia.