Which term refers to the muscle group associated with the shoulder blade and the upper arm bone?

• A. Pectoral girdle muscles
• B. Scapulohumeral muscles
• C. Latissimus dorsi muscles
• D. Levator scapulae muscles

Answer: (B)

The main idea is that some shoulder muscles span from the shoulder blade to the upper arm bone, crossing the shoulder joint to move and stabilize the arm. These are the scapulohumeral muscles. They originate on the scapula and insert on the humerus, forming the muscle group that directly links the shoulder blade to the upper arm bone. Because of this scapula-to-humerus connection, they control a wide range of shoulder motions, from lifting the arm to rotating it. Other muscle groups mentioned act more on the girdle itself or on the humerus in a broader sense, but they don’t specifically describe this scapula-to-humerus set that defines the shoulder’s primary moving muscles.