Which muscle's action includes drawing the scapula dorsally and cranially?

• A. Trapezius
• B. Rhomboideus
• C. Omotransversarius
• D. Superficial pectoral

Answer: (B)

The correct choice is the rhomboideus muscle. This muscle is primarily responsible for the action of retracting and elevating the scapula, moving it dorsally and cranially. It plays a crucial role in stabilizing the shoulder girdle by connecting the scapula to the vertebral column, particularly at the cervical and thoracic levels. The orientation and attachment points of the rhomboideus allow it to facilitate this specific movement, which is essential for actions that involve bringing the shoulder back and upward.

In contrast, the trapezius muscle does contribute to the motion of the scapula but has a more complex role involving elevation, retraction, and rotation, depending on the specific fibers activated. The omotransversarius muscle primarily assists in the movement of the limb and doesn't play a primary role in retracting the scapula. The superficial pectoral primarily functions in adducting the forelimb rather than influencing scapular movement in the described direction. Understanding these distinctions clarifies why the rhomboideus is specifically associated with drawing the scapula dorsally and cranially.