Which muscles are categorized as the muscles of the arm?

The muscles that are categorized as the muscles of the arm primarily include the triceps, biceps, and deltoid. These muscles are directly involved in the movement of the shoulder and elbow joints, facilitating actions such as flexion and extension of the arm.

The biceps brachii muscle, located on the anterior aspect of the upper arm, plays a significant role in elbow flexion and forearm supination. The triceps brachii, found on the posterior side of the upper arm, is responsible for elbow extension. The deltoid muscle, which caps the shoulder, is critical for arm abduction, flexion, and extension.

The pectoralis major, although primarily considered a muscle of the chest, also plays a part in arm movement by aiding in shoulder flexion and adduction. Together, these muscles contribute to the functional movements of the arm.

The other options include muscles from different regions of the body that do not typically classify as muscles of the arm. For instance, the quadriceps and hamstrings are major muscle groups of the thigh, supporting actions within the leg rather than the arm. Similarly, the trapezius and latissimus dorsi are back muscles involved in shoulder and upper torso movements. Lastly