▁sub div ision ▁of ▁the ▁ere ctor ▁sp inae ▁mus cles ▁that ▁extends ▁forward ▁into ▁the ▁trans verse ▁processes ▁of ▁the ▁posterior ▁cer v ical ▁verte bra e . ▁ ▁Str ucture ▁ ▁Long iss im us ▁thor ac is ▁et ▁l umb orum ▁The ▁long iss im us ▁thor ac is ▁et ▁l umb orum ▁is ▁the ▁intermediate ▁and ▁largest ▁of ▁the ▁continu ations ▁of ▁the ▁ere ctor ▁sp inae . ▁ ▁In ▁the ▁lum bar ▁region ▁( long iss im us ▁l umb orum ), ▁where ▁it ▁is ▁as ▁yet ▁bl ended ▁with ▁the ▁ili oc ost alis , ▁some ▁of ▁its ▁fib ers ▁are ▁attached ▁to ▁the ▁whole ▁length ▁of ▁the ▁posterior ▁surfaces ▁of ▁the ▁trans verse ▁processes ▁and ▁the ▁access ory ▁processes ▁of ▁the ▁lum bar ▁verte bra e , ▁and ▁to ▁the ▁anterior ▁layer ▁of ▁the ▁l umb od ors al ▁fas cia . ▁ ▁In ▁the ▁thor ac ic ▁region ▁( long iss im us ▁thor ac is ), ▁it ▁is ▁inserted , ▁by ▁rounded ▁tend ons , ▁into ▁the ▁tips ▁of ▁the ▁trans verse ▁processes ▁of ▁all ▁the ▁thor ac ic ▁verte bra e , ▁and ▁by ▁f les hy ▁processes ▁into ▁the ▁lower ▁nine ▁or ▁ten ▁rib s ▁between ▁their ▁t uber cles ▁and ▁angles . ▁ ▁Long iss im us ▁cer vic is ▁The ▁long iss im us ▁cer vic is ▁( trans vers alis ▁cer vic is ), ▁situated ▁med ial ▁to ▁the ▁long iss im us ▁thor ac is , ▁ar ises