The nerve to supraspinatus branches from the suprascapular nerve at or just distal to the suprascapular notch, before the nerve curves around the spinoglenoid notch. Its proximal takeoff means that suprascapular notch compression affects both supraspinatus and infraspinatus, while spinoglenoid notch compression spares supraspinatus.
The supraspinatus branch is preserved in spinoglenoid notch lesions, making its EMG status the key distinguishing feature between proximal and distal suprascapular neuropathy. Volumetric atrophy of supraspinatus on MRI indicates proximal suprascapular notch compression. Selective activation of supraspinatus in shoulder rehabilitation targets this nerve's motor territory for rotator cuff strengthening.
Combined supraspinatus and infraspinatus denervation from suprascapular notch compression producing weakness of abduction and external rotation with supraspinous and infraspinous fossa muscle wasting, treated by suprascapular notch decompression.
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