Start big-picture and superficial and hone in to deeper structures.
Muscles about the shoulder girdle

Rotator cuff musculature

Ligaments of shoulder girdle

Periarticular shoulder structures

Cause of non-traumatic shoulder pain

Frozen Shoulder
Shoulder pathology – Frozen shoulder from Vladimir Mischenko on Vimeo.
References
- Non-traumatic shoulder pain in general practice: a pragmatic approach to diagnosis – MedicineWise, July 2018
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