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(The malleolus-like bone at the lower medial aspect of the posterior wrist is the location of Shenmen [HT7] (Shenmen, Spirit Gate), an acupoint on the wrist appendage). This area belongs to the Hand-Shaoyin Heart Meridian (The *Ling Shu* states: "The meridian of the Hand-Shaoyin follows the posterior medial border of the arm and reaches the end of the sharp bone behind the palm." The *Su Wen* states: "In the middle region, the Hand-Shaoyin meridian corresponds to the Heart. Note: The Heart pulse is located at the end of the sharp bone behind the palm, in the territory of Shenmen, where the pulsation is palpable by hand." The *Ling Shu* further states: "Wherever pathogenic factors reside in the Heart, they are actually in the Pericardium. The Pericardium is the meridian of the Heart Master; therefore, it has no [acupoints for direct treatment of the organ itself]. If the exterior meridian is diseased but the zang organ is not, one should exclusively select points on this meridian at the end of the sharp bone behind the palm." Shen Chengzhi argues: My commentary notes that the so-called 'exterior meridian' refers to the Hand-Jueyin Pericardium Meridian. The phrase 'the zang organ is not diseased' means that the Heart organ itself does not become diseased. For instance, conditions such as Shaoyin or Jueyin heart pain radiating to the throat with body heat, which are fatal and incurable, do not imply that the Heart does not get sick. The *Nan Jing* states: "If the Heart pulse is found, its external manifestations include a red face, dry mouth, and excessive laughter; its diseases involve vexation in the heart, heart pain, and heat in the palms accompanied by pain. If these symptoms are present, it is a Heart disease; if absent, it is not. These several syndromes are all diseases generated by disturbances in the Hand-Jueyin meridian. The reason the *Nan Jing* places them under the Hand-Shaoyin meridian is precisely to emphasize that the Heart Master cannot be diseased directly, and its disorders are all of the exterior meridian type. It is unclear why it is solely stated that the Shaoyin has no [specific acupoint for the organ]." Generally, the five zang organs have acupoints; for the Heart, these are the two Shenmen points at the sharp bone. Now it says there are no acupoints, which is confusing. I leave this doubt aside for future clarification." Gu Yingbai states: My commentary notes that the *Jia Yi Jing* records that among the eight acupoints of the Shaoyin, seven have therapeutic effects, while one does not, because pathogens cannot lodge there; hence it is said that there are "no [therapeutic acupoints]." The general meaning of the statement in the classics that the Heart Master has no acupoints is roughly as described above. Did the sages of old fail to consider this? The 'exterior meridian' refers to the meridians of the Heart; the zang organs are internal, while the meridians are external. Generally, when meridians are diseased, acupuncture and moxibustion can treat them. However, if the true zang organs themselves are diseased, these are considered incurable conditions, not just limited to the Heart meridian. The Pericardium and the Heart Master are essentially not two separate organs; those who regard the Jueyin as the exterior meridian of the Shaoyin commit a significant error)." This point is also an intersection with the Hand-Taiyang Small Intestine Meridian (The *Ling Shu* states: "The meridian of the Hand-Taiyang follows the lateral side of the hand and ascends past the wrist, emerging from between the malleoli").