The wrist bends through the coordinated action of several muscles and tendons, primarily the flexor carpi radialis and the flexor carpi ulnaris.
Understanding Wrist Movement
Our wrists are complex joints allowing for a range of motions, including flexion (bending towards the palm), extension (bending backward), radial deviation (bending towards the thumb), and ulnar deviation (bending towards the pinky finger). This intricate movement is possible due to the interaction of bones, muscles, tendons, and ligaments.
Key Muscles and Tendons Involved in Wrist Flexion:
- Flexor Carpi Radialis: This tendon is a major player in wrist flexion. It originates in the forearm and inserts into the base of the second and third metacarpal bones (hand bones) and the trapezium (a wrist bone). [Reference: 18-Dec-2017 (Source unspecified)]
- Flexor Carpi Ulnaris: This tendon works alongside the flexor carpi radialis to bend the wrist. [Reference: 18-Dec-2017 (Source unspecified)]
These tendons are activated by contracting their corresponding muscles in the forearm. When these muscles contract, they pull on the tendons, causing the wrist to bend towards the palm (flexion). The interplay between these two tendons allows for a smooth and controlled range of motion.
Simplified Explanation:
Imagine pulling a string attached to your hand. The flexor carpi radialis and flexor carpi ulnaris act like those strings. When your brain signals these muscles to contract, they pull on the tendons, bending your wrist.
