The first metacarpal is one of the five long bones in the hand, specifically located in the palm. It connects the wrist to the thumb, playing a crucial role in thumb movement and grip. This bone is shorter and thicker than the other metacarpals, providing stability and strength for various hand functions. The first metacarpal articulates with the carpals at the base and the proximal phalanx of the thumb at its head. Its unique structure allows for a wide range of motion, enabling the thumb to perform essential tasks such as grasping and pinching.