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(Located posterior to the Yuji point [L10, Great Rampart], at the prominent high bone on the upper medial aspect of the wrist postero-inferiorly, marking the boundary between Jingqu [LU8] and Taiyuan [LU9]. Also known as Maikou [Pulse Mouth] or Cunkou [Inch Port]), it belongs to the Hand-Taiyin Lung Meridian (The *Ling Shu* states: The meridian of Hand-Taiyin follows the inner aspect of the arm along the lower edge of the bone, entering the Cunkou. It also states: The sinews of Hand-Taiyang ascend along the fingers, knotting behind the fish belly, and running on the lateral side of the Cunkou. Furthermore: Lung Qi travels via the Taiyin; its movement is linked to respiration. Thus, with each exhalation, the pulse moves twice; with each inhalation, the pulse also moves twice. As respiration does not cease, the pulse movement does not stop. Additionally: Meridians are generally invisible. Their deficiency or excess can be known through the Qikou [Vital Port]. An expert physician discerns pathological signs from the five colors in the eyes and understands how to adjust the characteristics of size, magnitude, speed, and texture [slippery/rough] of the Cun and Chi positions to diagnose disease. If the pulse is tight, the skin at the Chi position is also tense; if the pulse is slow, the skin at the Chi position is also lax; if the pulse is small, the skin at the Chi position is diminished and Qi is deficient; if the pulse is tight, the skin at the Chi position is bulging; if the pulse is slippery, the skin at the Chi position is smooth; if the pulse is choppy, the skin at the Chi position is rough. All these variations range from mild to severe. Therefore, one skilled in examining the Chi need not rely solely on the Cun; one skilled in examining the pulse need not rely solely on facial complexion. One who can integrate and apply these methods may be considered an "Upper Physician" (Expert Doctor). The *Su Wen* states: The Middle Heaven corresponds to Hand-Taiyin, used for observing the pulse. The commentary notes: The Lung pulse is located within the Cunkou at the wrist crease, specifically at Jingqu [LU8], where the beat is palpable. It further states: Pulse Qi flows through the meridians, and Meridian Qi returns to the Lung. The Lung receives all vessels and distributes essence to the skin and hair. The combination of Hair and Vessel essence allows Qi to circulate through the Fu organs. The clarity of Fu organ spirit remains in the Zang organs, and Qi returns to a state of balance. When balanced, the Cunkou forms the Cun pulse, which is used to determine life and death. Wu Caolu stated: The Cun, Guan, and Chi positions on both hands constitute a single pulse line of the Hand-Taiyin Lung Meridian. Pulse circulation begins in the Lung, ends in the Liver, and then reunites in the Lung. Since the Lung is the portal for Qi entry and exit, it is called Qikou, serving as the great assembly of pulses to assess the whole body). It also generally governs the six Yin meridians of the Hand and Foot (The *Ling Shu* states: If the Maikou pulse is one-fold stronger, the pathology is in the Foot-Jueyin Liver Meridian; if one-fold stronger and restless, the pathology is in the Hand-Jueyin Pericardium Meridian. If the Maikou pulse is two-fold stronger, the pathology is in the Foot-Shaoyin Kidney Meridian; if two-fold stronger and restless, the pathology is in the Hand-Shaoyin Heart Meridian. If the Maikou pulse is three-fold stronger, the pathology is in the Foot-Taiyin Spleen Meridian; if three-fold stronger and restless, the pathology is in the Hand-Taiyin Lung Meridian. If the Maikou pulse is four-fold stronger, large and rapid, it is named Yin Overflow. Yin Overflow leads to Internal Obstruction; if Internal Obstruction is blocked, death ensues and cannot be treated. It also states: If both the Renying [ST9] and Taichong/Maikou pulses are more than four times stronger, it is termed Guan-Ge [Gate Closure]. Patients with Guan-Ge have a short life expectancy. Furthermore: In healthy individuals, the Maikou and Renying pulses should correspond to the four seasons. It also states: By holding the Qikou and Renying to observe their pulses, if the pulse is firm, strong, and slippery, the disease progresses daily; if the pulse is soft, the disease will subside. For excess patterns in the various meridians, recovery occurs within three days. The Qikou observes Yin, while the Renying observes Yang).