Which two muscles are supplied by the dorsal scapular nerve?

The dorsal scapular nerve primarily innervates the rhomboid major, rhomboid minor, and levator scapulae muscles. The correct answer highlights the direct association of the nerve with both the rhomboids and the levator scapulae.

The rhomboids are responsible for retracting the scapula, drawing it towards the vertebral column, and also assist in elevation and rotation of the scapula. The levator scapulae aids in elevating the scapula and also assists in the downward rotation of the scapula. The function of these muscles is significant in maintaining proper shoulder mechanics and posture.

In contrast, the other choices include muscles that are not supplied by the dorsal scapular nerve. For instance, the subscapularis is innervated by the upper and lower subscapular nerves; serratus anterior is innervated by the long thoracic nerve, and pectoralis minor receives its nerve supply from the medial pectoral nerve. This distinction underscores the specific role of the dorsal scapular nerve in supplying particular muscles critical for scapular movement and stabilization.