▁( P NS ). ▁Gli al ▁cells ▁function ▁to ▁support ▁neur ons ▁and ▁in ▁the ▁P NS , ▁also ▁include ▁satellite ▁cells , ▁ol factory ▁ens he ath ing ▁cells , ▁enter ic ▁gl ia ▁and ▁gl ia ▁that ▁res ide ▁at ▁sens ory ▁n erve ▁end ings , ▁such ▁as ▁the ▁Pac in ian ▁cor pus cle . ▁The ▁two ▁types ▁of ▁Schw ann ▁cells ▁are ▁my elin ating ▁and ▁non my elin ating . ▁ ▁My elin ating ▁Schw ann ▁cells ▁wrap ▁around ▁ax ons ▁of ▁motor ▁and ▁sens ory ▁neur ons ▁to ▁form ▁the ▁my elin ▁she ath . ▁The ▁Schw ann ▁cell ▁prom oter ▁is ▁present ▁in ▁the ▁down stream ▁region ▁of ▁the ▁human ▁d yst roph in ▁gene ▁that ▁gives ▁short ened ▁trans cript ▁that ▁are ▁again ▁synth es ized ▁in ▁a ▁t issue - specific ▁manner . ▁ ▁During ▁the ▁development ▁of ▁the ▁P NS , ▁the ▁regul atory ▁mechan isms ▁of ▁my el ination ▁are ▁controlled ▁by ▁feed forward ▁interaction ▁of ▁specific ▁gen es , ▁influen cing ▁trans cription al ▁cas c ades ▁and ▁sh aping ▁the ▁morph ology ▁of ▁the ▁my elin ated ▁n erve ▁fib ers . ▁ ▁Schw ann ▁cells ▁are ▁involved ▁in ▁many ▁important ▁aspects ▁of ▁peri pher al ▁n erve ▁bi ology — the ▁condu ction ▁of ▁nerv ous ▁imp uls es ▁along ▁ax ons , ▁n erve ▁development ▁and ▁reg ener ation , ▁tro ph ic ▁support ▁for ▁neur ons , ▁production ▁of ▁the ▁n erve ▁ext rac ell ular