Hand Muscles' Surprising Role in Joint Cracking Sound
Scientists have discovered a surprising role for a group of hand muscles in the cracking sound produced when joints move quickly. Known as the dorsal interossei, these four muscles are located between the metacarpals on the back of the hand. The largest among them, the first dorsal interosseous, is situated between the thumb and index finger.
Researchers Kevin D. Evans and colleagues have been studying the function of these muscles. Their findings suggest that the dorsal interossei may contribute to the sound generated when joints are moved swiftly, causing them to snap or crack. These muscles primarily flex the first knuckle, but they also extend and abduct the fingers. Abduction involves moving the fingers away from the middle finger. Each muscle is attached to two metacarpals and the base of the fingers, providing added strength for these movements.
The dorsal interossei, often associated with hand movements, have an unexpected role in the cracking sound produced by joints. This discovery, made by researchers including Kevin D. Evans, sheds light on the complex functions of these muscles and may contribute to a better understanding of joint mechanics.
