Where does the lung meridian end?

The lung meridian is known to terminate at the radial border of the nail of the thumb. This endpoint is significant in Traditional Chinese Medicine, as it relates to the functions and pathways of the lung meridian, which is responsible for regulating respiration and the distribution of Qi throughout the body. The lung meridian's trajectory begins in the chest and travels along the arm, reflecting its connection to both the respiratory system and upper body functions.

Understanding the anatomical pathway and endpoint is crucial for practitioners, as it helps in identifying acupuncture points for treatment. In this case, the endpoint at the thumb allows for therapeutic applications that can influence lung health and respiratory conditions. This is particularly important as the thumb and its meridian points can be directly stimulated for both diagnosis and treatment purposes.

The other options offer different locations that do not align with the established terminus of the lung meridian. The radial border of the nail of the thumb is specifically recognized within acupuncture literature and practice as the terminal point for this meridian. Knowing these specifics helps practitioners to accurately treat and enhance the therapeutic effects related to the lung and its pathways.