Introduce the needle into the center of the triangle formed by the two lower heads of the sternomastoid and the clavicle, aiming toward s the ipsilateral nipple.

• 在胸锁乳突肌下两头（胸锁乳突肌下端有两个起点，分别起自胸骨柄前面和锁骨的胸骨端，译者注）和锁骨形成的三角中心处进针，穿向同侧乳头方向。