What is the anatomical position of SP-21 along the body?

The anatomical position of SP-21, also known as the Great Embracement point of the Spleen channel, is specifically located along the mid-axillary line. This point is situated on the lateral side of the thorax, approximately at the level of the 6th intercostal space, making it easily accessible and relevant for needling techniques in acupuncture practice.

Identifying this point at the mid-axillary line is crucial because it helps practitioners localize SP-21 accurately and understand its relevance to the Spleen meridian, which plays an important role in issues related to digestion, energy, and fluid regulation. The mid-axillary line serves as a reference in anatomy, signifying a vertical line that runs from the armpit downwards along the side of the body, thus reinforcing the knowledge of its anatomical landmarks.

In contrast, the other descriptions do not accurately reflect the location of SP-21. Being lateral to the femoral artery refers to the region around the thigh, which does not correspond to the location of the Spleen meridian's Great Embracement point. Similarly, the description of halfway between the elbow and the wrist pertains to points along the arm, and the depression at the center of