Needling ST-2 (sibai) with lifting and thrusting may injure which structure?

Needling ST-2 (Sibai), which is located just below the eye in the infraorbital region, requires careful technique due to the anatomical structures in close proximity. The correct answer is the infraorbital nerve, which runs beneath the skin in this area and provides sensory innervation to the lower eyelid, cheek, and upper lip.

When using lifting and thrusting techniques during needling, there is a risk of penetrating too deeply or at an incorrect angle, which could potentially damage the infraorbital nerve. This could lead to complications such as numbness, tingling, or pain in the regions supplied by the nerve.

Other structures mentioned, like the orbital vein and the sinus cavity, may also be of concern during needling, but they are located further away or in different anatomical orientations that make them less likely to be directly affected by needling ST-2. The infratrochlear nerve is also in the vicinity, but the infraorbital nerve is the primary structure at risk due to its direct course near the acupuncture point. Thus, understanding the anatomical layout around ST-2 emphasizes the need for precision and care in needling techniques.