What is the wrist joint?
In human anatomy, the wrist is variously defined as:
- The carpus or carpal bones, the complex of eight bones forming the proximal skeletal segment of the hand,
- The wrist joint or radiocarpal joint, the joint between the radius and the carpus
- The anatomical region surrounding the carpus including the distal parts of the bones of the forearm and the proximal parts of the metacarpus or five metacarpal bones and the series of joints between these bones, thus referred to as wrist joints. This region also includes the carpal tunnel, the anatomical snuff box, the flexor retinaculum, and the extensor retinaculum.
The wrist joint is also a synovial joint, meaning that it contains a fluidic capsule that sits between two bones that move against each other (in this case, the wrist bones and the forearm bones). The synovial capsule lubricates the joint, allowing for smooth movement.
The tendons that control the articulation of the wrist run through the forearm. The tendons that help move the wrist include the flexor carpi radialis, flexor carpi ulnaris, palmaris longus tendon, extensor carpi radialis brevis, extensor carpi radialis longus, and extensor carpi ulnaris.