Anatomy
Course
Arises in the upper trunk of brachial plexus (formed by the union of C5 and C6). Passes downward, laterally (deep to the omohyoid and trapezius, then posteriorly beneath trapezius) before reaching the suprascapular notch.
Travels beneath the suprascapular notch before dividing into two branches; one supplies supraspinatus, the other supplies infraspinatus.
Supply
Sends sensory branches to both the glenohumeral (shoulder) and acromioclavicular joints.
Innervates the supraspinatus and infraspinatus muscles (does not innervate skin).
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