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Supraspinatus
Orgin: Supraspinous Fossa of Scapula
Incertion: Greater tubercle of humerus (superior facet)
Action: Abduction of humerus
Stabilization of head of humerus
Nerve: Suprascapular nerve (Cervial 5, 6)
Palpate: Bring ear down to shoulder to relax trapezius and palpate above the spine of scapula near the acromion during active abduction of humerus
The superaspinatus , infraspinatus and teres minor insert, respectively on the superior, middle, and inferior facets of the greater tubercle of the humerus and thus can be recalled by the first letter of their names as the “SIT” muscles, supraspinatus being the S of the SIT muscles. This muscle pulls the head of the humerus into the glenoid fossa and thus acts as an effective stabilizer for humerus abduction. It reinforces the capsule of the shoulder joint and is one of the “rotator cuff” muscles.
