Final answer:
The middle trapezius muscle is responsible for scapular retraction.
Explanation:
The muscle that produces retraction of the scapula is the middle trapezius. The middle trapezius muscle is one of the muscles located on the posterior thoracic region that assists in moving and stabilizing the scapula, helping in actions like retracting the shoulder.
Another muscle involved in this region is the subscapularis, which is part of the rotator cuff muscles and helps in medially rotating the arm but is not primarily responsible for scapular retraction.
The teres major muscle, despite its origin on the scapula, is mainly involved in adducting the arm, not in scapular retraction.
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