Flexor Digitorum Superficialis, Medial View

Description

Arising from the medial epicondyle of the humerus and the proximal ulna, the flexor digitorum superficialis (FDS) forms a broad muscle belly on the anterior forearm, positioned superficial to flexor digitorum profundus and deep to the superficial fascia. From a medial perspective, its muscle fibers run distally into four tendons that pass deep to the flexor retinaculum at the wrist and continue into the hand toward digits II to V. Medial landmarks typically include the ulna along the ulnar border, the medial aspect of the radius crossing laterally, and the elbow and radiocarpal joints as proximal and distal reference points. Tendons dominate distally. Clinically, a medial view of the FDS clarifies the flexor-pronator mass at the medial elbow and its shared origin, a common pain generator in medial epicondylitis (golfer’s elbow) and a key consideration during surgical exposure around the ulnar nerve in the cubital tunnel. The distal tendon course also supports teaching around carpal tunnel relationships, since the FDS tendons occupy the carpal tunnel alongside flexor digitorum profundus and flexor pollicis longus. This is where hand function is tested, using isolated proximal interphalangeal joint flexion to assess FDS integrity in tendon lacerations. Use this artwork in upper limb anatomy modules, hand surgery and sports medicine teaching files, or in medical publisher figures explaining forearm flexor compartments and tendon anatomy at the wrist. It also suits patient-facing education on flexor tendon repair and rehabilitation protocols, where tendon routing and gliding surfaces matter. Anatomical accuracy verified by SciePro's Medical Advisory Board.