On the chest, in the first intercostal space, 4 cun lateral to the midline (Huagai REN-20), on the mamillary line.
How To Find It
1. First locate the costal cartilage of the second rib which is level with the sternal angle then locate the first intecostal space above it.
2. Note that in males the nipple lies in the fourth intercostal space.
3. Note that the intercostal spac