Huangdi Neijing , also known as the Inner Canon of Huangdi or The Emperor's Inner Canon, is an ancient Chinese medical text that has been treated as the fundamental doctrinal source for Chinese medicine for more than two millennia. The work is composed of two texts each of eighty-one chapters or treatises in a question-and-answer format between the mythical Huangdi (Yellow Emperor or more correctly Emperor) and six of his equally legendary ministers.