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Infraspinatus
Origin: Infraspinous Fossa of Scapula
Insertion: Greater tubercle of humerus (middle facet)
Action: Lateral rotation
Extension of humerus
Nerve: Suprascapular nerve (Cervical 5, 6)
Palpate: Lean trunk forward with arm hanging down and shoulder relaxed. Palpate along axillary border of scapula below posterior deltoid during active lateral rotation of the humerus.
Infraspinatus is the “I” of the “SIT” muscles (see supraspinatus and teres minor). It reinforces the capsule of the shoulder joint and is one of the “rotator cuff” muscles. This muscle together with teres minor and teres major also helps stabilize the head of the humerus.
