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Supraspinatus
Origin:
medial 2/3 supraspinous fossa of scapula
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Supraspinatus
Insertion:
greater tubercle of humerus
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Supraspinatus
Action:
initial 10-15 degrees of GH joint abduction; stabilizes head of humerus in glenoid (compression)
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Supraspinatus
Innervation:
suprascapular
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Infraspinatus
Origin:
medial 2/3 of infraspinaous fossa of scapula
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Infraspinatus
Insertion:
greater tubercle of humerus
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Infraspinatus
Action:
external rotation of humerus, stabilizes head of humerus in glenoid, downward glide of head of humerus
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Infraspinatus
Innervation:
suprascapular
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Teres Minor
Origin:
upper 2/3 and dorsal surface of lateral border of scapula
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Teres Minor
Insertion:
greater tubercle of humerus
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Teres Minor
Action:
external rotation of humerus, stabilizes head of humerus in glenoid, downward glide of head of humerus
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Teres Minor
Innervation:
axillary
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Subscapularis
Origin:
subscapular fossa of scapula
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Subscapularis
Insertion:
lesser tubercle of humerus
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Subscapularis
Action:
internal rotation of humerus, stabilizes head of humerus in glenoid, downward glide of head of humerus
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Subscapularis
Innervation:
subscapular
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