The upper limbs are the arms, from the shoulder to the fingertips. They are responsible for a wide range of movements, including reaching, grasping, and manipulating objects. Key anatomical structures include: Bones: The humerus (upper arm), radius and ulna (forearm), and the carpals, metacarpals, and phalanges* (hand and fingers). Joints: The shoulder joint (ball-and-socket), elbow joint (hinge), and wrist joint* (condyloid). Muscles: Numerous muscles allow for flexion, extension, abduction, adduction, rotation, and supination/pronation of the limb. Nerves: Major nerves like the median, ulnar, and radial nerves* control muscle function and sensation. Blood Vessels: Arteries and veins supply oxygenated blood and remove deoxygenated blood.