The metacarpophalangeal joint (MCP joint) is the connection between the metacarpal bones of the hand and the phalanges, which are the bones of the fingers. Each hand has five MCP joints, allowing for the bending and straightening of the fingers. These joints play a crucial role in hand movements, enabling actions like gripping and pinching. The MCP joints are classified as synovial joints, specifically condyloid joints, which allow for movement in two planes: flexion-extension and abduction-adduction. They are surrounded by a joint capsule and supported by ligaments, providing stability while allowing a range of motion essential for daily activities.