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The Pericardium (Xinbaoluo), according to the *Nan Jing* (Classic of Difficult Issues), is considered formless. However, examining the discussion of the "Twelve Officials" in the *Nei Jing* (Inner Canon), there is no mention of the Pericardium, but rather the title of Tanzhong (Chest Center/Shanzhong). Essentially, Tanzhong is the cavity where the Heart resides; the Heart is stored within it, as if wrapped or covered. Thus, Tanzhong is indeed the Pericardium, and it is not formless. Regarding the Sanjiao (Triple Burner), the Classics state that the Upper Jiao is like mist (Upper Jiao refers to the area above the diaphragm. It is the region for the distribution of clear Yang qi, and its qi state resembles mist.), the Middle Jiao is like fermentation/soaking (Middle Jiao refers to the area below the diaphragm and above the navel. It is the zone for water and food, where contents remain and ferment like soaking.), and the Lower Jiao is like a drainage ditch (Lower Jiao refers to the area below the navel. It is where feces and urine exit, resembling the clearing of ditches.). The shape of the Sanjiao is also not mentioned. Debaters have argued endlessly, akin to catching wind and shadows, without any concrete reference. Only Zhang Jingyue stated that the Sanjiao is essentially the body cavity (Qiangzi). The zang-fu organs are like objects inside, while the cavity is like a bag containing these objects. People only recognize the objects themselves but fail to realize that the bag itself is also an entity. His explanation is very logical. (Ancient texts stating that the Sanjiao has a name but no form likely referred to the void space inside the cavity but outside the zang-fu organs, which is the pathway for the circulation of Sanjiao fire-qi.) Based on this, I pondered that humans have only ten zang-fu organs, with the Heart as the Sovereign and the rest as ministers. The Sanjiao is the body cavity. (I privately suggest that the character "Jiao" should be read as "Zhui" (vertebrae). The human spine consists of twenty-one vertebrae: the Upper Jiao corresponds to the upper seven vertebrae, the Middle Jiao to the middle seven, and the Lower Jiao to the lower seven. The character "Zhui" was borrowed/written as "Jiao". This can be verified by observing that in the *Ling Shu · Back-Shu Chapter*, the 5th, 7th, 9th, 11th, and 14th vertebrae are all written as "Jiao".) It is like the capital city, where the Sovereign and ministers reside together. The Pericardium is the Tanzhong, like the inner palace city, where the Sovereign resides alone. The palace city is internal, and the capital city is external; internal belongs to Yin, and external belongs to Yang. Therefore, the Sanjiao is also called a Fu organ, while the Pericardium is also called a Zang organ. Since the Sanjiao is the body cavity, it is tangible/form-bearing. If it has form, it must have meridians. All meridians within the body cavity are meridians of the Sanjiao, but because they are not named separately by specific regions, they are difficult to point to specifically. Thus, those meridians that connect with various zang-fu organs are assigned to the respective connected zang-fu organs and named as the meridians of that specific Zang or Fu. Those without specific assignment are named the meridians of the Sanjiao. This is analogous to how all lands of the Nine Provinces are the King's territory, but apart from the enfeoffed feudal lords' domains, the remainder constitutes the Royal Domain directly controlled by the king. The meridians of the Pericardium are also part of the Sanjiao meridians that connect to the Tanzhong, distributed to form the Twelve Regular Meridians. (The Eight Extraordinary Vessels are also distinct categories derived from the Sanjiao meridians, similar to how within the Royal Domain there are fiefs for dukes, marquises, counts, viscounts, and barons.)