Heart meridian descends from armpit along ulnar of medial side of upper limb and passes elbow joint and wrist joint then along proximal of little finger to finger tip.

Crossing meridians and collaterals of heart meridian of hand-shaoyin:
Heart meridian crosses small meridian at Tongli acupoint and connects with small meridian at Shaochong (HT 9) and Shaoze (SI 1) acupoints.

Origination acupoints of heart meridian of hand-shaoyin:
Qingling, Xiaohai (SI 8), Lingdao, Tongli, Yinxi, Shenme, Shaofu, Shaochong.

Distribution lines of collateral of heart meridian of hand-shaoyin:
Collateral of heart meridian diverges two branches from Tongli acupoint. One branch crosses small meridian, another branch ascends along the regular meridian and is distributed in chest.