The arms are the upper limbs of the human body, extending from the shoulders to the hands, and are essential for a wide range of movements and functions. Each arm is made up of three main sections: the upper arm, the forearm, and the hand.

The upper arm contains the humerus, the long bone that connects the shoulder to the elbow. The forearm consists of two bones: the radius and the ulna, which allow for rotation of the wrist and other precise movements. The hand is a complex structure made up of the wrist, palm, and fingers, allowing for gripping, holding, touching, and manipulating objects with great precision.

At the top, the shoulder joint—a ball-and-socket joint—connects the arm to the torso and gives the arm a wide range of motion in multiple directions. The movement and strength of the arm are controlled by a network of muscles, including the biceps, triceps, deltoids, and various smaller muscles that coordinate fine motor skills. Tendons, ligaments, and nerves work alongside these muscles to support flexibility, control, and sensation.

Arms play a crucial role not only in physical tasks—such as lifting, throwing, pushing, and pulling—but also in communication, including gestures, waving, and sign language. They are vital to everyday activities and allow humans to interact effectively with their environment.