Figure 1.

Anatomic schema displaying the course of the SSN from the brachial plexus (left side of image) to its muscular target. The SSN branches off the upper trunk of the brachial plexus and courses from anteromedial to posterolateral through the posterior triangle of the neck. It then passes through the suprascapular notch at the base of the coracoid under the TSL (labeled in purple). Sensory fibers travel to the glenohumeral joint while motor fibers innervate the supraspinatus muscle. The nerve then traverses the spinoglenoid notch under the variable spinoglenoid ligament (labeled in orange). From here, the nerve supplies motor function to the infraspinatus.