<unk>  nerve (C5, 6) branches from the superior trunk and innervates the supraspinatus and infraspinatus nerves
Compression of the nerve in the<unk>  notch (proximal, supraspinatus and infraspinatus affected) or at spinoglenoid ligament (distal, only infraspinatus affected)
Most often seen in athletes due to repetitive overhead arm movements
Structural (direct nerve compression)
Paralabral cyst
Bone/soft tissue tumor
Trauma
Traction injury
Rotator cuff tear
Glenohumerol dislocation
Scapular fracture
Penetrating injury
Autoimmune
Parsonage-Turner syndrome
Iaotrogenic
Paralabral cyst
Bone/soft tissue tumor
Traction injury
Rotator cuff tear
Glenohumerol dislocation
Scapular fracture
Penetrating injury
Parsonage-Turner syndrome
Suprascapular neuropathy
Carpal tunnel syndrome
Spinal accessory neuropathy
Pronator teres syndrome
Long thoracic neuropathy
Anterior interosseous neuropathy
Axillary neuropathy
Ulnar neuropathy