▁to ▁the ▁right , ▁reaching ▁nearly ▁as ▁far ▁as ▁the ▁posterior ▁longitud inal ▁sul cus . ▁There ▁have ▁been ▁multiple ▁anom al ies ▁described , ▁for ▁example ▁the ▁left ▁circum flex ▁having ▁an ▁aber rant ▁course ▁from ▁the ▁right ▁coron ary ▁ar tery . ▁ ▁Branch es ▁The ▁circum flex ▁ar tery ▁curves ▁to ▁the ▁left ▁around ▁the ▁heart ▁within ▁the ▁coron ary ▁sul cus , ▁giving ▁rise ▁to ▁one ▁or ▁more ▁left ▁marg inal ▁ar ter ies ▁( also ▁called ▁obt use ▁marg inal ▁branches ▁( OM )) ▁as ▁it ▁curves ▁toward ▁the ▁posterior ▁surface ▁of ▁the ▁heart . ▁It ▁helps ▁form ▁the ▁posterior ▁left ▁vent ric ular ▁branch ▁or ▁poster ol ater al ▁ar tery . ▁The ▁circum flex ▁ar tery ▁ends ▁at ▁the ▁point ▁where ▁it ▁joins ▁to ▁form ▁to ▁the ▁posterior ▁inter vent ric ular ▁ar tery ▁in ▁ 1 5 % ▁of ▁all ▁cases , ▁which ▁lies ▁in ▁the ▁posterior ▁inter vent ric ular ▁sul cus . ▁In ▁the ▁other ▁ 8 5 % ▁of ▁all ▁cases ▁the ▁posterior ▁inter vent ric ular ▁ar tery ▁comes ▁out ▁of ▁the ▁right ▁coron ary ▁ar tery . ▁When ▁the ▁left ▁circum flex ▁supplies ▁the ▁posterior ▁desc ending ▁ar tery ▁in ▁those ▁ 1 5 % ▁of ▁cases , ▁it ▁is ▁known ▁as ▁a ▁left ▁dominant ▁circul ation . ▁ ▁Struct ures ▁supplied ▁The ▁L C X ▁supplies ▁the ▁poster ol ater al ▁left ▁vent ric le ▁and ▁the ▁an ter ol ater al ▁pap ill ary ▁mus cle . ▁