Change of Safe Needling Depth at Acupoint GB21 according to Posture and Breathing

Figure 1

Identification of GB21 and subject posture. (a) Lateral end of the acromion. (b) Spinous process of the seventh cervical vertebra. (c) GB21, in the posterior region of the neck, at the midpoint of the line connecting the spinous process of the seventh cervical vertebra (C7) with the lateral end of the acromion. (d) Sitting position. (e) Prone position A. (f) Prone position B.

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(b)

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(f)