The human body has the twelve meridians.

In traditional Chinese medicine, the twelve meridians divides the meridians into hand meridians and foot meridians according to the relationship between meridians and some viscera in the body and different parts of limb circulation. Yin meridian and Yang meridian. That is, the three yin meridians of the hand and the three yin meridians of the foot; Three yang meridians of hand and three yang meridians of foot.

Hand Sanyang Meridian: Hand Yangming Large Intestine Meridian, Hand Taiyang Small Intestine Meridian, Hand Shaoyang Sanjiao Meridian.

Foot Sanyang Meridian: Foot Yangming Stomach Meridian, Foot Taiyang Bladder Meridian and Foot Shaoyang Gallbladder Meridian.

Three yin meridians of hand: lung meridian of hand Taiyin, heart meridian of hand Shaoyin and pericardium meridian of hand Jueyin.

Foot Three Yin Meridian: Foot Taiyin Spleen Meridian, Foot Shaoyin Kidney Meridian and Foot Jueyin Liver Meridian.

Yin meridian mainly runs on the inside of limbs, belonging to viscera, collaterals and viscera in the body. Yang meridian mainly runs on the outside of limbs, belonging to the fu-organ collaterals in the body. Hand meridian runs on the upper limb and foot meridian runs on the lower limb.