What is the primary muscle responsible for elbow extension?

The primary muscle responsible for elbow extension is the triceps brachii. This muscle is located on the backside of the upper arm and is specifically designed to extend the forearm at the elbow joint. When the triceps contracts, it pulls the forearm upward and straightens the arm, effectively achieving elbow extension.

Understanding the anatomy of the arm is crucial in recognizing how movements occur. The biceps brachii, on the other hand, is primarily involved in elbow flexion, meaning it helps bend the arm. The pectoralis major and trapezius muscles have different functions; the pectoralis major primarily aids in shoulder movement, while the trapezius is involved in movements of the shoulders and neck. This highlights the importance of associating specific movements with their primary muscle groups for effective training and rehabilitation practices.