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Category - Exercise Selection

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The lateral deltoid muscle gets all the glory for its primary role as shoulder abductor. However, without the complementary role of the rotator cuff, the deltoid would be a weak shoulder elevator indeed! Which of the following is the LEAST likely to participate in this complementary role as a part of the rotator cuff?
  1. Infraspinatus
  2. Supraspinatus
  3. Teres minor
  4. Teres major
Explanation
Answer: D - The rotator cuff complex is comprised 4 main muscles: the supraspinatus, infraspinatus, teres minor, and subscapularis. The teres major does help stabilize the head of the humerus in the glenoid fossa, but it does not assist in elevation. Rather the teres major works in tandem with the latissimus major to internally rotate the shoulder and adduct the arm back down from an abducted position.
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