Figure 3: The AUC of CMAP of the lateral (1) and long head (2) of triceps recorded by stimulating the middle trunk are more than 50% ( 37.244 μV2) of the sum of the same AUC recorded by stimulating the upper and lower trunks (30.191 μV2). Note that flexor carpi radialis (4) has also a major contribution from the middle trunk. In this case the harvest of contralateral C7 has not been performed.