Arms are the paired upper limbs of the human body that extend from the shoulders to the hands. Each arm consists of three main parts: the upper arm (containing the humerus bone), the forearm (comprising the radius and ulna bones), and the hand, which includes the wrist, palm, and fingers. The shoulder joint connects the arm to the torso and allows for a wide range of motion. Arms are powered by a complex network of muscles, tendons, and ligaments, enabling actions such as lifting, pushing, pulling, holding, and fine motor skills like writing or manipulating objects. Nerves running through the arms provide sensation and control. Beyond physical functions, arms also play a key role in communication through gestures and expressions like hugs and handshakes.