id ▁which ▁is ▁found ▁in ▁the ▁cell ▁memb ran es ▁of ▁many ▁types ▁of ▁verte br ate ▁cells . ▁During ▁peri pher al ▁n erve ▁reg ener ation , ▁ 9 - O - ac et yl ▁G D 3 ▁is ▁expressed ▁by ▁Schw ann ▁cells . ▁ ▁Function ▁The ▁verte br ate ▁nerv ous ▁system ▁re lies ▁on ▁the ▁my elin ▁she ath ▁for ▁ins ulation ▁and ▁as ▁a ▁method ▁of ▁decre asing ▁memb rane ▁capac it ance ▁in ▁the ▁ax on . ▁The ▁action ▁potential ▁j umps ▁from ▁node ▁to ▁node , ▁in ▁a ▁process ▁called ▁salt atory ▁condu ction , ▁which ▁can ▁increase ▁condu ction ▁velocity ▁up ▁to ▁ 1 0 ▁times , ▁without ▁an ▁increase ▁in ▁ax onal ▁diameter . ▁In ▁this ▁sense , ▁Schw ann ▁cells ▁are ▁the ▁P NS ' s ▁analog ues ▁of ▁the ▁central ▁nerv ous ▁system ' s ▁o lig od end ro cy tes . ▁However , ▁unlike ▁o lig od end ro cy tes , ▁each ▁my elin ating ▁Schw ann ▁cell ▁provides ▁ins ulation ▁to ▁only ▁one ▁ax on ▁( see ▁image ). ▁This ▁arrangement ▁perm its ▁salt atory ▁condu ction ▁of ▁action ▁potential s ▁with ▁re prop ag ation ▁at ▁the ▁nodes ▁of ▁Ran vier . ▁In ▁this ▁way , ▁my el ination ▁greatly ▁increases ▁speed ▁of ▁condu ction ▁and ▁saves ▁energy . ▁ ▁Non my elin ating ▁Schw ann ▁cells ▁are ▁involved ▁in ▁maintenance ▁of ▁ax ons ▁and ▁are ▁cru cial ▁for ▁neur onal ▁surv ival . ▁Some ▁group