Anatomy of the Flexor Pollicis Longus

Courtesy: Prof Nabil Ebraheim, University of Toledo, Ohio, USA
Video describes the Anatomy of Flexor Pollicis Longus Muscle. It is one of the three deep flexors muscles of the forearm. The Flexor Pollicis Longus Muscle Originates from the anterior surface of the Radius and the Interrosseus membrane. It runs through the carpal tunnel and get inserted into the base of palmar aspect of the distal phalanx of thumb. It is supplied by the Median Nerve through the Anterior Interosseous Nerve. This Muscle helps in performing the OK sign. The Primary Action of this muscle is to flex the thumb at Metacarpo-phalangeal and Interphalangeal joints.