Which of the following correctly matches the origin, insertion, and primary action of the supraspinatus?

• A. Origin: supraspinous fossa of the scapula. Insertion: greater tubercle of the humerus. Action: initiates and assists in abduction of the arm (first 15 degrees).
• B. Origin: infraspinous fossa of the scapula. Insertion: greater tubercle of the humerus. Action: external rotation of the arm.
• C. Origin: subscapular fossa of the scapula. Insertion: lesser tubercle of the humerus. Action: internal rotation of the arm.
• D. Origin: supraspinous fossa of the scapula. Insertion: lesser tubercle of the humerus. Action: extends the arm.

Answer: (A)