Which LU point lies on the antero-lateral aspect of the chest, below the lateral extremity of the clavicle, 6 cun lateral to the midline, in the centre of the hollow of the delto-pectoral triangle?

• A. LU-4
• B. LU-2
• C. LU-3
• D. LU-1

Answer: (B)

The key idea is the anatomical landmark of the Lung channel in the chest region. The point sits in the hollow between the deltoid and pectoralis major muscles, known as the delto-pectoral triangle. It is located on the antero-lateral chest, 6 cun lateral to the midline, directly below the lateral end of the clavicle. This description matches Yunmen, the second point of the Lung channel, which sits at the center of that delto-pectoral hollow.

Other Lung points are in different locations (for example, LU-1 is in the first intercostal space closer to the midline, LU-3 and LU-4 are on the upper arm), so this exact chest-hollow site specifically identifies LU-2.