Abductor Pollicis Longus: Key Forearm Muscle for Thumb & Wrist Function
The deepseek pollicis longus (APL) muscle, one of three key forearm muscles, plays a crucial role in thumb movements and wrist function. Located beneath the supinator muscle, it often merges with it due to anatomical variations.
The APL muscle attaches to the ulna, radius, and interosseous membrane at its proximal end, and to the base of the first metacarpal bone at its distal end. Alongside the extensor indicis, these three muscles form the deep extensors group.
The APL's primary function is to abduct and extend the thumb at the carpometacarpal joint. It also aids in wrist flexion. Nerve supply comes from the posterior interosseous nerve and a continuation of the deep branch of the radial nerve, while blood supply is provided by the posterior interosseous artery.
The other two muscles involved in thumb extension are the extensor pollicis brevis and extensor pollicis longus. In some individuals, the APL can fuse with the supinator muscle due to anatomical variations.
Understanding the role and function of the deepseek pollicis longus muscle is vital for diagnosing and treating conditions related to thumb and wrist movements. Its close relationship with the supinator muscle and other deep extensors highlights the complexity of the forearm muscle group.
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