《黄帝内经·灵枢·经脉》
它的支脉，从缺盆上走颈部，贯通颊部，下入齿龈，回转绕至上唇，左右两脉交会于人中，左脉向右，右脉向左，上行挟于鼻孔两侧，与足阳明胃经相接。
其支者，从缺盆上颈，贯颊，入下齿中，还出挟口，交人中，左之右，右之左，上挟鼻孔。
Its branches go from Quepen up the neck, penetrate the cheeks, go down the gums, turn around the upper lip, and the left and right meridians meet at Renzhong. The left meridian goes to the right, the right meridian goes to the left, goes up along both sides of the nostrils, and connects with the foot Yangming Stomach Meridian.