徑橫脈(radial crossvein,r):連接Rl與R2;
橫脈(crossvein)多根據所連接的縱脈而命名。常見的橫脈有:
肩橫脈(humeralcrossvein,h):連接C和Sc脈,位於近肩角處;
分橫脈(sectorial crossvein,s):連接R3與R4或R2十3與R4十5;
徑中橫脈(radiomedial crossvein,r—s):連接R4+5與Ml+2;
中橫脈(medial crossvein,m):連接m2與m3;
中肘橫脈 (mediocubital crossvein,m—cu):連接M3十4與Cul等。