The fourth metacarpal is one of the five long bones in the hand, located between the wrist and the fingers. It connects to the ring finger, playing a crucial role in hand movement and grip. Each metacarpal bone has a base, shaft, and head, contributing to the structure and function of the hand. In humans, the fourth metacarpal is typically longer and stronger than the second and third metacarpals, providing support for the ring finger. Injuries to this bone can affect hand function, making it important for activities involving grasping and manipulating objects.