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The Hand-Shaoyin Heart Meridian originates within the heart, emerges to connect with the Xinxi (Heart System, tissues connecting the heart to other organs), descends through the diaphragm, and links with the Small Intestine; its branch ascends from the Xinxi, flanking the pharynx, and connects with the Muxi (Eye System, meridians linking the eyeballs to the brain); its main trunk returns from the Xinxi, ascends into the Lung, descends out of the axilla, follows the posterior medial aspect of the upper arm, runs posterior to the Hand-Taiyin Lung Meridian and the Hand-Jueyin Pericardium Meridian, descends to the medial aspect of the elbow, follows the posterior medial aspect of the forearm, reaches the end of the ulnar styloid process (Rui Gu) at the wrist, enters the medial aspect of the palm, and terminates at the radial side of the tip of the little finger. When the meridian undergoes pathological changes, symptoms include dryness of the pharynx, heart pain, thirst with desire to drink, which is termed "Bi Jue" (Arm Jue). This meridian governs diseases originating in the Heart, such as yellowing of the eyes, hypochondriac pain, pain or coldness along the posterior medial aspect of the arm, and heat/pain in the palm. These are manifestations of disorders of this meridian.

This passage describes the course of the Heart Meridian's Qi, which is the fifth of the twelve meridians. The Xinxi has two parts: one part connects upward with the Lung, entering between the large lobes of the lung; the other part descends from the lung lobes, curves backward, runs alongside the spine internally, and connects via fine collaterals through the spinal cord to the Kidney, located precisely at the level of the seventh vertebral segment. Generally, the systems of the five Zang organs all connect to the Heart, and the Heart connects to the systems of the five Zang organs. The Hand-Shaoyin Heart Meridian originates in the heart, courses lateral to the Ren Mai (Conception Vessel), connects with the Xinxi, descends through the diaphragm, and links with the Small Intestine at a point 2 cun above the umbilicus; its branch emerges from the Xinxi, coursing lateral to the Ren Mai, ascends to flank the pharynx, and connects with the eyes; its main trunk rises directly from the Xinxi to the region of the Lung, exits laterally to the axilla, reaching the Ji Quan (HT1) acupoint (located in the tendon gap under the axilla on the medial arm, where the artery pulses into the chest), descends from Ji Quan along the posterior medial aspect of the upper arm, running posterior to the Hand-Taiyin Lung and Hand-Jueyin Pericardium meridians, passes through the Qing Ling (SI12) acupoint, descends to the medial aspect of the elbow to reach the Shao Hai (HT3) acupoint, the ankle bone below the wrist is called Dui Gu (ulnar styloid), from Shao Hai it descends along the posterior medial aspect of the forearm, passing through the Ling Dao (HT4) and Tong Li (HT5) acupoints, reaches the end of the Dui Gu at the wrist, passes through the Yin Xi (HT6) and Shen Men (HT7) acupoints into the medial palm, reaches the Shao Fu (HT8) acupoint, and terminates at the Shao Chong (HT9) acupoint at the tip of the little finger, thereby connecting with the Hand-Taiyang Small Intestine Meridian. Thus, its pathogenic manifestations include symptoms such as dry throat and heart pain.

Hand-Shaoyin Heart Meridian Diagram
The heart weighs twenty-two liang, attaches to the fifth thoracic vertebra of the spine, resides below the lungs and above the diaphragm, contains seven orifices and three hairs, and holds three he of essence fluid. The Heart primarily houses the Shen (Spirit). *Su Wen · Ling Lan Mi Dian Lun* states: "The Heart is the official of the sovereign, from whom the Shen emerges." *Ben Cang* Chapter 6 states: "If the Heart is small, it is stable, and evil cannot harm it, but it is prone to death due to sorrow; if the Heart is large, sorrow cannot harm it, but it is easily injured by evil. If the Heart is high, it presses against the lungs causing fullness, depression, and forgetfulness, making it difficult to persuade with words; if the Heart is low, the viscera are exposed and easily injured by cold, making one easily frightened by words. If the Heart is firm, the viscera are secure and stable; if the Heart is fragile, it is prone to Xiao Dan (wasting-thirst) and Re Zhong (internal heat). If the Heart is upright, harmony prevails and injury is difficult; if the Heart is tilted, willpower is inconsistent, lacking steadfastness. Red complexion with fine texture indicates a small Heart; coarse texture indicates a large Heart. Absence of transverse lines indicates a high Heart; short and elevated transverse lines indicate a low Heart. Long and firm transverse lines indicate a firm lower Heart; weak and thin transverse lines indicate a fragile Heart. Transverse lines straight down without elevation indicate an upright Heart; transverse lines leaning to one side indicate a tilted Heart."