Which point is located at the anterior border of the SCM and is known as the Sea of Qi?

The point located at the anterior border of the sternocleidomastoid (SCM) muscle and known as the Sea of Qi is indeed ST-9, also referred to as "Renying." This point is situated on the neck, at the level of the laryngeal notch, and is recognized for its significance in accessing the abundant Qi of the body. It is traditionally associated with the regulation of Qi and plays a vital role in treating conditions related to energy stagnation or deficiency.

The term "Sea of Qi" emphasizes its connection to the gathering and circulation of vital energy, making it an important point in acupuncture for treatments aimed at invigorating the body's energy. The anatomical location at the anterior border of the SCM makes it easily identifiable and accessible for practitioners during treatment.

Other points listed, such as ST-1, ST-25, and ST-40, do not share this specific location or association with the Sea of Qi. ST-1 is primarily used for eye disorders, ST-25 is a key point for abdominal issues related to the large intestine, and ST-40 is noted for its role in phlegm-related issues and is located much more distally on the leg. Thus, ST-9 is unique in