The widths of SANare1.7 ± 0.2 mm. The distances of SANat the anterior border of trapezius from claviclesare 38.2 ± 8.5 mm. SAN weresectioned at the points distal to the third branchesfor the trapezius conserve entire motor branches for superior fibers of the trapeziusis 93.3% in the cases.