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The arm muscles are responsible for many movements, from complex precision tasks such as painting, to tasks requiring great strength, such as lifting. The muscles attach to the bones of the arms: the humerus in the upper arm and the ulna and radius in the forearm.

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1. Arm Muscle Movements

  • Flexion: two body parts coming towards each other. For example, moving the upper arm and forearm closer together by bending the elbow.
  • Extension: two body parts moving further away from one another, such as when the arm is straightened.
  • Abduction: movement away from the body’s center. For instance, lifting the arm away from the body.
  • Adduction: movement toward the body's center, such as placing the hand on the chest.
  • Pronation: rotation of the forearm so that the palm is facing down.
  • Supination: rotation of the forearm so the palm is facing up.
  • leonello / Getty Images
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