Which meridian starts on the ulnar side of the 4th finger?

The correct answer is the San Jiao meridian, which is also known as the Triple Energizer or Triple Warmer. This meridian plays a vital role in the regulation of body temperature and fluid metabolism. It is unique in acupuncture as it is considered neither entirely yin nor yang but rather as a functional system that encompasses both aspects. The San Jiao meridian begins at the ulnar side of the fourth finger, also known as the ring finger, and travels upward, influencing the body's ability to manage and distribute qi and fluids throughout the three jiao: the upper, middle, and lower energizers.

In contrast, the Spleen meridian, the Pericardium meridian, and the Small Intestine meridian originate from different points on the body. The Spleen meridian begins on the medial side of the big toe, the Pericardium starts at the center of the chest and moves toward the arm, and the Small Intestine starts at the ulnar side of the little finger. Knowing the specific starting points of these meridians is crucial for acupuncturists, as it aids in accurate diagnosis and treatment reinforcing the importance of understanding meridian pathways.