Dagukong dà gǔ kōng · 大骨空

Location. On the back of the thumb, at the midpoint of the transverse crease of the interphalangeal joint.

The name is a description of the landmark: da means large, gu is bone, and kong is hollow or opening, so it is the hollow at the large knuckle, the single joint of the thumb. It is a point outside the fourteen channels. Like other points sited on a finger joint, classical writing records moxa here more often than needling, and it is one of several extra points on the hand that later literature discusses in the context of the eyes. That association is a matter of what is written, not of what has been shown: the classical record for this point is much thinner than for the channel points of the hand, its reported effects are not established by modern research, and this entry makes no claim of benefit.