唇，属足太阴脾经（《素问》曰∶脾者仓廪之本，营之居也，其华在唇。《灵枢》曰∶脾者主为胃，使之迎粮，视唇
舌奸恶以知吉凶。故唇上下好者神端正，唇偏举者脾偏倾。揭唇者脾高，唇下纵者脾下。唇坚者脾坚，唇大而不坚者
脾脆。脾病者唇黄，脾绝者四面肿。又曰∶唇者，肌肉之本也，脉不营则肌肉不滑泽，不滑泽则肉满，肉满则唇反，唇
反者肉先死，甲曰笃，乙曰死），又属足阳明胃（《灵枢》曰∶足阳明所生病者，口 唇胗。胗，古疹字，唇疡也），又属
手少阴经（《玄珠》曰∶上下唇皆赤者，心热也，上唇赤、下唇白，肾虚而心火不降也）。
又属手太阴肺（钱仲阳曰∶肺主唇。唇白而泽者吉，白如枯骨者死。唇白当补脾，肺盖脾者，肺之母也）。
侠口，统属冲任二脉（《灵枢》曰∶二脉皆起胞中，上循背里，为经络之海；其浮而外者，循腹右上行，会于咽喉
而络口唇。故气血盛则生须）。上唇侠口，属手阳明大肠经；下唇侠口，属足阳明胃。
舌，属手少阴心经（《内经》曰∶心气通于舌，心和则知五味矣），又属足太阴脾经（张鸡峰曰∶脾主四肢，其脉
连舌本而络于唇），又属足少阴肾经（《灵枢》曰；足少阴正直者，系舌本。《玄珠》曰∶舌之下窍，廉泉穴也，肾
之津液所潮），又属足厥阴肝经（《灵枢》曰∶肝者筋之合也，筋者聚于阴器，而络于舌本）。舌主五味，以荣养于
身，资于脾，以分津液于五脏。故心之本脉，系于舌根；脾之本脉，系于舌旁；肝脉循阴器，络舌本。
嘴唇，归属于足太阴脾经（《素问》说：脾是仓廪的根本，营气居住的地方，其荣华表现于嘴唇。《灵枢》说：脾主要辅助胃，为胃接纳食物，通过观察嘴唇和舌头的善恶变化来预知吉凶。所以嘴唇上下端正的，说明神志端正；嘴唇偏向一侧抬举的，说明脾脏位置偏斜。嘴唇上翻的，说明脾脏位置偏高；嘴唇下垂松弛的，说明脾脏位置偏低。嘴唇坚实的，说明脾脏坚实；嘴唇大但不坚实的，说明脾脏脆弱。患脾病的，嘴唇发黄；脾脏功能衰竭的，嘴唇四周肿胀。又说：嘴唇是肌肉的根本，如果经脉的气血不能滋养，肌肉就不光滑润泽；不光滑润泽则肌肉胀满；肌肉胀满则嘴唇外翻；嘴唇外翻的，说明肌肉先死亡，逢甲日病情加重，逢乙日死亡），同时也归属于足阳明胃经（《灵枢》说：足阳明经所发生的疾病，包括口唇生疮。胗，是古时的疹字，指唇部的溃疡），同时也归属于手少阴心经（《玄珠》说：上下嘴唇都发红的，是心热；上唇红、下唇白的，是肾虚而心火不能下降）。同时也归属于手太阴肺经（钱仲阳说：肺主管嘴唇。嘴唇白而有光泽的是吉兆，白得像枯骨一样的是死证。嘴唇发白应当补脾，因为肺属金，脾属土，土生金，所以脾是肺的母亲）。环绕口部，统属于冲脉和任脉（《灵枢》说：这两条脉都起于胞中，向上沿着脊柱内部上行，成为经络之海；其中浮行于体表的，沿着腹部右侧上行，交会于咽喉并联络口唇。所以气血旺盛就会生长胡须）。上唇环绕口部，归属于手阳明大肠经；下唇环绕口部，归属于足阳明胃经。
舌头，归属于手少阴心经（《内经》说：心气通于舌头，心气调和就能辨别五味了），同时也归属于足太阴脾经（张鸡峰说：脾主管四肢，其经脉连接舌根并联络于嘴唇），同时也归属于足少阴肾经（《灵枢》说：足少阴肾经直行的分支，系连舌根。《玄珠》说：舌头下面的窍穴是廉泉穴，是肾之津液汇聚之处），同时也归属于足厥阴肝经（《灵枢》说：肝主筋，筋会聚于生殖器，并联络于舌根）。舌头主管辨别五味，用来荣养身体，依赖脾的运化，将津液分布到五脏。所以心的本经经脉，系连于舌根；脾的本经经脉，系连于舌旁；肝经循行经过生殖器，联络于舌根。
The lips belong to the Foot-Taiyin Splein Meridian (Suwen states: The spleen is the foundation of the granaries, the residence of Ying Qi (Nutritive Qi), and its luster manifests in the lips. Ling Shu states: The spleen primarily assists the stomach in receiving food; by observing the condition of the lips and tongue, one can predict auspicious or inauspicious outcomes. Therefore, if the upper and lower lips are symmetrical and upright, it indicates correct spirit; if the lip deviates and lifts on one side, it indicates a tilted spleen. If the lips are everted upward, the spleen is high; if the lips hang down loosely, the spleen is low. If the lips are firm, the spleen is solid; if the lips are large but not firm, the spleen is fragile. In spleen diseases, the lips turn yellow; when spleen function fails, swelling occurs around the four sides of the lips. It is also said: The lips are the root of muscles. If meridians do not nourish them, muscles will not be smooth and lustrous; if not smooth and lustrous, muscles become distended; if distended, the lips evert outward. When lips evert outward, muscle tissue dies first; the condition worsens on Jia days and death occurs on Yi days). They also belong to the Foot-Yangming Stomach Meridian (Ling Shu states: Diseases occurring in the Foot-Yangming meridian include oral ulcers. 'Zhen' is an ancient character for 'zhen' (rash), referring to lip sores). They also belong to the Hand-Shaoyin Heart Meridian (Xuan Zhu states: Redness of both upper and lower lips indicates heart heat; redness of the upper lip and whiteness of the lower lip indicate kidney deficiency with failure of heart fire to descend). They also belong to the Hand-Taiyin Lung Meridian (Qian Zhongyang states: The lung governs the lips. Whiteness with luster is auspicious; whiteness like dry bone indicates death. For white lips, tonify the spleen, as the lung (Metal) is the child of the spleen (Earth)). Surrounding the mouth, they are collectively governed by the Chong Mai (Penetrating Vessel) and Ren Mai (Conception Vessel) (Ling Shu states: These two vessels originate from the Baozhong (uterus/pelvic cavity), ascend along the interior of the back, and serve as the Sea of Meridians; those floating externally ascend along the right side of the abdomen, converge at the throat, and connect to the lips. Thus, abundant qi and blood result in beard growth). The upper lip surrounding the mouth belongs to the Hand-Yangming Large Intestine Meridian; the lower lip surrounding the mouth belongs to the Foot-Yangming Stomach Meridian.
The tongue belongs to the Hand-Shaoyin Heart Meridian (Neijing states: Heart qi connects to the tongue; when heart qi is harmonious, the five flavors are perceived). It also belongs to the Foot-Taiyin Splein Meridian (Zhang Jifeng states: The spleen governs the four limbs, and its meridian connects to the root of the tongue and links to the lips). It also belongs to the Foot-Shaoyin Kidney Meridian (Ling Shu states: The straight branch of the Foot-Shaoyin meridian ties to the root of the tongue. Xuan Zhu states: The aperture below the tongue is the Lianquan acupoint, where fluids from the kidney gather). It also belongs to the Foot-Jueyin Liver Meridian (Ling Shu states: The liver governs sinews; sinews gather at the genitalia and link to the root of the tongue). The tongue governs the perception of the five flavors to nourish the body, relying on the spleen to distribute fluids to the five zang organs. Thus, the primary meridian of the heart ties to the root of the tongue; the primary meridian of the spleen ties to the sides of the tongue; the liver meridian circulates through the genitalia and links to the root of the tongue.