Which muscles cover the serratus posterior superior muscles?

• A. Trapezius and Rhomboid muscles
• B. Latissimus dorsi and Teres major
• C. Infraspinatus and Teres minor
• D. Serratus anterior and Pectoralis minor

Answer: (A)

Back muscle layering on the back shows that serratus posterior superior sits beneath the more superficial muscles of the upper back. The trapezius forms a broad superficial sheet over the upper back, and the rhomboid muscles lie directly beneath it along the medial border of the scapula. Because serratus posterior superior is a thin muscle in this region, it is covered by both the trapezius and the rhomboids. The other muscle groups listed are located either in different planes or regions (latissimus dorsi and teres major are more lateral and lower; infraspinatus and teres minor are on the scapular blade; serratus anterior and pectoralis minor are anterior chest muscles), so they don’t cover this posterior muscle.