Which point is located on the chest in the second intercostal space, 4 cun lateral to the midline, on the mamillary line?

• A. ST 14
• B. ST 15
• C. ST 16
• D. ST 18

Answer: (C)

Locating chest points uses the mamillary line, which is the horizontal line 4 cun lateral to the midline, aligned roughly with the nipple, and the intercostal spaces between the ribs. The description “second intercostal space, 4 cun lateral to the midline, on the mamillary line” pinpoint exactly where a Stomach channel point sits on the chest. That intersection is the point in question. The other options are in different intercostal spaces or not on the mamillary line, so they don’t match this specific location.