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Origin and insertion of supraspinatus
- Origin- Supraspinous fossa of the scapula
- Insertion- Greater tubercle of the humerus (right on top)
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Action, R/NR and D/S/B of supraspinatus
- Abducts the shoulder to 30 degrees
- Stabilizes head of humerus in glenoid cavity
- Depresses the head of the humerus
- (most commonly injured)
- NR
- D to upper traps
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Origin and insertion of infraspinatus
- Origin- Infraspinous fossa of scapula
- Insertion- Greater tubercle of the humerus
-
Action, R/NR and D/S/B of Infraspinatus
- Laterally rotates the shoulder
- Adducts shoulder
- Stabilizes head of humerus in glenoid cavity
- NR
- B (deep to posterior deltoid)
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Origin and insertion of teres minor
- Origin- Upper 1/2 of lateral border of the scapula
- Insertion- Greater tubercle of the humerus
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Action, R/NR and D/S/B of Teres Minor
- Laterally rotates shoulder
- Adducts shoulder
- Stabilizes head of humerus in glenoid cavity
- NR
- B (insertion is deep to posterior deltoid)
-
Origin and insertion of subscapularis
- Origin- subscapular fossa of the scapula (anterior)
- Insertion- Lesser tubercle of the humerus
-
Action, R/NR and D/S/B of Subscapularis
- Medially rotates the shoulder joint
- Stabilizes head of the humerus in glenoid cavity
- NR
- D
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