This Chapter from The Yellow Emperor’s Classic of Internal Medicine details the dimensions and capacities of the human digestive system, as described by Bó Gāo to the Yellow Emperor. Precise measurements in traditional Chinese units are provided for the mouth, throat, stomach, small intestine, large intestine, and rectum, including their lengths, widths, capacities, and number of coils. The text meticulously charts the pathway of food through these organs, culminating in a total length calculation for the entire digestive tract. The focus is on the anatomical specifics of the digestive system, rather than its physiological functions. The detailed measurements aim to offer a comprehensive understanding of its structure.