Where is ST-42 located in relation to the metatarsal bones?

The point ST-42, known as "Chongyang," is located at the junction of the second and third metatarsal bones. This anatomical location is significant because it is specifically situated in the second web space of the foot, where the second and third metatarsals converge.

Understanding this point’s location is crucial for practitioners of acupuncture, as accurate needle placement relies heavily on anatomical landmarks. The junction of the metatarsal bones allows access to the associated channel path and can be utilized in treatment protocols that target issues related to the stomach meridian, which is integral to digestive health among other functions.

The other options indicate locations that are either incorrect anatomical references or describe points that do not align with the defined location of ST-42, emphasizing the necessity of precise knowledge in anatomy for effective practice in acupuncture.