The Yin Yang Shiyi Mai Jiujing ( simplified Chinese: 阴阳十一脉灸经; traditional Chinese: 陰陽十一脈灸經; pinyin: Yīn Yáng Shíyī Mài Jiǔjīng), or Cauterization Canon of the Eleven Yin and Yang Vessels, is an ancient Chinese medical text that was excavated in 1973 from a Han-dynasty tomb in Mawangdui Han tombs site ( Hunan province) that had been sealed in 168 BCE. [1] It was handcopied in seal script on the same sheet of silk as the Recipes for Fifty-Two Ailments and another text on cauterization during the Qin dynasty, around 215 BCE. [2] The text describes the pathways of eleven vessels or channels (mai 脉) inside the body, as well as the ailments associated with each vessel. [2] It contains many textual parallels with the later medical text known as the Lingshu, one extant version of the Huangdi Neijing. [3]