What is the location for the Lower He Sea point SJ, BL-39?

The Lower He Sea point for the San Jiao channel, also known as SJ 39, is located at the lateral end of the popliteal crease. This anatomical location is significant because He Sea points are traditionally used to influence the function of the corresponding organ system. For the San Jiao, SJ 39 can be used in the treatment of various conditions related to the lower body and the fluid metabolism due to its position in relation to the knee joint.

In acupuncture, the popliteal fossa, where SJ 39 is found, is an important area that serves as a reference point for several essential structures, including blood vessels and nerves. The lateral aspect of the popliteal crease allows easy palpation and needle insertion, making it practical for clinical use. This specific site benefits from local energy connections, which enhance the treatment's efficacy for conditions associated with the San Jiao channel.

The other options do not correspond to the correct anatomical location of SJ 39, as they refer to other significant points or regions in acupuncture without the specific association with the Lower He Sea point for the San Jiao channel. Understanding the precise locations of acupuncture points is crucial for effective treatment planning and application.