Figure 8: Price technique for the axillary nerve block. A line connects the anterior acromion (1) with the inferior angle of the scapula (2). The midpoint of the line represents the level of the horizontal axis (H) of the quadrilateral space. The line representing the vertical axis (V) is drawn down from the posterolateral aspect of the acromion (3) (Price [3]). (Reprinted with permission.)