Which muscles are involved in shoulder extension?

The muscle involvement in shoulder extension is characterized by the primary muscles that facilitate the movement of extending the arm backward. The posterior deltoid, teres major, and long head of the triceps brachii are integral to this action.

The posterior deltoid is specifically designed to assist in movements like extension, particularly in the shoulder joint. The teres major also plays a crucial role in shoulder extension as it helps in pulling the arm backward and assists in adduction and medial rotation. Additionally, the long head of the triceps brachii contributes to shoulder extension while also functioning at the elbow joint, particularly when the arm is in certain positions.

Other muscle groups mentioned in the incorrect options are responsible for different movements or do not play a primary role in shoulder extension. Understanding these specific muscle functions can significantly enhance knowledge of shoulder mechanics and contribute to effective rehabilitation and treatment planning for individuals dealing with shoulder injuries or conditions.