What is the location of K-22 in relation to the heart?

K-22, also known as "Shen-Que," is located at the junction of the 5th intercostal space and the lateral border of the sternum, which is near the heart's vicinity. This positioning aligns it closely with the apex of the heart. The apex of the heart is the pointed end of the heart that is directed downward, forward, and to the left, and K-22 sits in a position that corresponds with this anatomical feature, making it relevant in treatments or diagnoses concerning heart-related conditions and energy flow associated with the heart meridian.

While K-22 is somewhat near the diaphragm and between other anatomical structures, its primary significance in relation to heart conditions and acupuncture practices is its proximity to the apex, highlighting its importance in cardiovascular therapies. The mid-axillary line is located laterally and does not relate directly to the heart's structure or function in the context of K-22's location. Therefore, this specific anatomical relationship makes the reference to the apex of the heart the most accurate choice.