• Equine Shoulder Sweeney:
• Sweeney refers to pronounced neurogenic atrophy of the supraspinatus and infraspinatus muscles of the equine shoulder.
• Caused by direct trauma or stretch injury to the suprascapular nerve as it courses across the cranial border and neck of the scapula, lacking protective bony coverage.
• Denervation causes muscle wasting, leaving the scapular spine prominently exposed with lateral subluxation of the shoulder joint during weight-bearing ("shoulder slip").
• nalysis:
• (Supra-scapular): Correct nerve.

Correct option: (4) Supra-scapular