Anatomy
·Upper Limb
Rotator Cuff
⭐ PREMIUM
Four muscles (SItS) form a musculotendinous cuff that holds the humeral head in the glenoid and provides dynamic shoulder stability.
THE FOUR MUSCLES — "SItS"
• Supraspinatus (suprascapular n., C5,6): INITIATES abduction (first ~15°), then deltoid takes over.
• Infraspinatus (suprascapular n., C5,6): lateral (external) rotation.
• Teres minor (axillary n., C5,6): lateral (external) rotation.
•…
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