The human body's wrist, commonly referred to as the "wrist," is a complex structure that serves as a pivotal point for the upper limb. It acts as the junction between theupper arm, lower arm, and hand, serving as a base for numerous movements and actions. The wrist is comprised of several key components, including bones, tendons, ligaments, and muscles.
The most proximal part of the wrist is composed of eight small, short bones called carpals, which are arranged in a circular structure known as the carpus. These carpals are numbered from 1 to 8, starting from the ulnar side and moving towards the radial side. Each carpel is composed of three primary elements: the proximal row, middle row, and distal row.
The median wrist joint, located between the two rows of carpals, is a complex structure consisting of multiple bones and ligaments that allow for flexibility and motion in the wrist. The distal row of carpals is particularly important for hand movement, including wrist flexion and extension.
The wrist is also supported by several long tendons, including the palmar ulnaris and radial collateral tendons. These tendons are attached to bones in the wrist and serve to move the fingers and thumb, allowing for tasks such as picking up objects and handling tools.
The wrist is also enfolded by a capsule made of connective tissue that contains various structures, including blood vessels and nerves. This capsule provides a protective sheath for the delicate structures within the wrist and helps maintain their functionality.
In summary, the human wrist is a remarkable part of the body tasked with facilitating a wide range of movements. It is composed of numerous bones, tendons, ligaments, and muscles that work in concert to enable the wrist to perform its intricate array of actions. The wrist's versatility and stability allow us to perform daily tasks with ease, from simple gestures to more complex movements, making it a vital part of our everyday lives.
