《黄帝内经·灵枢·经脉》
在手掌后方距离腕关节三寸的部位从本经分出，由此而别行并进入于手太阴肺经的经脉。
去腕三寸，别入太阴。其别者，上循臂，乘肩髃，上曲颊伤齿。
At the spot on the back of the palm three cun away from the wrist joint, it separates from this meridian and diverges into the Hand TaiYin Lung meridian's channel.