《靈樞》雜癥論:“人身上部病取手陽(yáng)明經(jīng),中部病取足太陰經(jīng),下部病取足厥陰經(jīng),前膺病取足陽(yáng)明經(jīng),后背病取足太陽(yáng)經(jīng)。取經(jīng)者,取經(jīng)中之穴也。一病可用一二穴。”