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Schwann cells are the supporting cells of the PNS. Like oligodendrocytes schwann cells wrap themselves around nerve axons, but the difference is that a single schwann cell makes up a single segment of an axon's myelin sheath.
Schwann Cells - form myelin sheaths in PNS. Oligodendrocytes - envelop an average of 15 axonal. internodes each. Schwann cells - envelop only one internode. http://www.zoobotanica.plus.com/portfolio%20med. icine%20pages/neuronst.htm. http://cti.itc.virginia.edu/~psyc220/oligo.gif.