黄帝问于伯高曰。余愿闻六腑传谷者。肠胃之小大长短。受谷之多少奈何。伯高曰。请尽言之。
谷所从出入浅深远近长短之度。唇至齿长九分。口广二寸半。齿以后至会厌。深三寸半。大容五合。
舌重十两。长七寸。广二寸半。咽门重十两。广二寸半。至胃长一尺六寸。胃纡曲屈伸之。长二尺六
寸。大一尺五寸。径五寸。大容三斗五升。小肠后附脊左。环回周叠。积其注于回肠者。外附于脐
上。回运环十六曲。大二寸半。径八分分之少半。长三丈三尺。回肠当脐左环回周叶。积而下回运环
反十六曲。大四寸。径一寸寸之少半。长二丈一尺。广肠传脊。以受回肠。左环叶脊上下辟大八寸。
径二寸寸之大半。长二尺八寸。肠胃所入至所出。长六丈四寸四分。回曲环反三十二曲也。
此言有生之后。总藉水谷之所生养。故专论其肠胃。胃主受纳水谷。肠主传导变化。其精液血
气。由此而生焉。越人曰。唇为飞门。齿为户门。会厌为吸门。胃为贲门。太仓下口为幽门。大小肠
会为阑门。下极为魄门。盖
唇齿乃始受水谷之门。故先论唇齿之广长。舌者。主为卫使之迎粮。舌和而后能知五味。会厌者。
喉之上套。所以分别咽喉。咽乃胃之门。主受纳水谷。喉乃肺之窍。以司呼吸者也。
黄帝向伯高问道：我希望了解六腑传导水谷的情况，特别是肠胃的大小、长短以及它们容纳食物的容量是多少。伯高回答说：请允许我详细地说明。
食物进入和排出身体的路径，其深浅、远近、长短的度量标准是：从嘴唇到牙齿的长度为九分，口腔的宽度为二寸半。从牙齿后方到会厌的深度为三寸半，容积可容纳五合。
舌头重十两，长七寸，宽二寸半。咽门重十两，宽二寸半，连接到胃的长度为一尺六寸。胃迂曲屈伸，展开后的长度为二尺六寸，周长（大）为一尺五寸，直径为五寸，最大容量为三斗五升。
小肠后附于脊柱左侧，环绕回旋重叠，其汇聚注入回肠的部分，外附于脐部上方，回转环绕十六个弯曲，周长为二寸半，直径为八分又三分之一分，长度为三丈三尺。
回肠位于脐部左侧，环绕回旋叶片状排列，向下积聚并回转环绕反方向十六个弯曲，周长为四寸，直径为一寸又三分之二寸，长度为二丈一尺。
广肠（大肠下部）沿着脊柱分布，以接收回肠的内容物，左右环绕脊柱上下展开，周长为八寸，直径为二寸又三分之二寸，长度为二尺八寸。
从肠胃入口到出口，总长度为六丈四寸四分，共有三十二个回转弯曲。
这段话论述的是人出生后，总体依赖水谷来滋养生命，因此专门讨论肠胃。胃主要功能是受纳水谷，肠道主要功能是传导和变化。人体的精液、血气，由此产生。
《难经》说：嘴唇称为飞门，牙齿称为户门，会厌称为吸门，胃的上口称为贲门，太仓（胃）的下口称为幽门，大小肠交接处称为阑门，肛门称为魄门。
唇齿是开始接受水谷的门，所以先论述唇齿的宽度和长度。舌头的功能主要是作为护卫使者迎接粮食，舌的功能调和后才能辨别五味。会厌是喉部的上部套状结构，用来区分咽喉。咽是胃的门，主要功能是受纳水谷；喉是肺的窍道，主要功能是司管呼吸。
Huangdi asked Bo Gao: I wish to learn about the transmission of grain through the six fu organs, specifically regarding the size, length, and capacity of the stomach and intestines. Bo Gao replied: Please allow me to explain fully.
The measurements for the depth, distance, length, and breadth of the path where grain enters and exits are as follows: From the lips to the teeth is 9 fen; the width of the mouth is 2.5 cun; from behind the teeth to the epiglottis (Huiyan) is 3.5 cun in depth, with a capacity of 5 he.
The tongue weighs 10 liang, is 7 cun long, and 2.5 cun wide. The pharyngeal gate (Yanmen) weighs 10 liang, is 2.5 cun wide, and extends 1 chi 6 cun to the stomach. The stomach, when uncoiled and straightened, is 2 chi 6 cun long, has a circumference of 1 chi 5 cun, a diameter of 5 cun, and a maximum capacity of 3 dou 5 sheng.
The small intestine (Xiaochang) attaches posteriorly to the left side of the spine, looping and overlapping. Its portion that gathers and directs contents into the ileum attaches externally above the navel. It loops around sixteen times, with a circumference of 2.5 cun, a diameter of 8 fen plus one-third of a fen, and a length of 3 zhang 3 chi.
The ileum (Hui chang) loops on the left side of the navel, arranging in leaf-like folds, accumulating downwards and looping back sixteen times in reverse direction. It has a circumference of 4 cun, a diameter of 1 cun plus two-thirds of a cun, and a length of 2 zhang 1 chi.
The large intestine (Guochang, specifically the lower part/rectum) runs along the spine to receive contents from the ileum, spreading left and right around the spine. It has a circumference of 8 cun, a diameter of 2 cun plus two-thirds of a cun, and a length of 2 chi 8 cun.
From the entry to the exit of the gastrointestinal tract, the total length is 6 zhang 4 cun 4 fen, comprising thirty-two loops and turns.
This passage discusses how life after birth relies entirely on water and grain for nourishment, thus focusing specifically on the stomach and intestines. The stomach is primarily responsible for receiving and storing food and drink, while the intestines are responsible for conducting and transforming waste. Essence, fluid, blood, and qi are generated from this process.
The *Nanjing* (Classic of Difficult Issues) states: The lips are the Flying Gate (Feimen); the teeth are the Door Gate (Humen); the epiglottis is the Suction Gate (Ximen); the cardia of the stomach is the Constrictor Gate (Benmen); the lower opening of the Tai Cang (stomach) is the Navel Gate (Youmen); the junction of the small and large intestines is the Screen Gate (Lanmen); and the anus is the Corporeal Soul Gate (Pomen).
The lips and teeth are the initial gates for receiving water and grain, so their dimensions are discussed first. The tongue serves as the guardian messenger to welcome food; only when the tongue's function is harmonized can the five flavors be discerned. The epiglottis is the upper hood of the larynx, used to distinguish between the pharynx and the larynx. The pharynx is the gate of the stomach, primarily responsible for receiving food and drink; the larynx is the orifice of the lung, primarily responsible for governing respiration.