The flexor digitorum superficialis is a muscle within the intermediate compartment of the anterior forearm. Attachments: Originates from the medial epicondyle of the humerus and the radius. The muscle splits into four tendons at the wrist, which travel through the carpal tunnel, and attach to the base of the middle phalanx of the four digits. Actions: Flexes the metacarpophalangeal joints and proximal interphalangeal joints at the 4 fingers, and flexes at the wrist. Innervation: Median nerve. Blood supply: Ulnar artery. Adobe Stock, Licensed to TeachMeSeries Ltd Fig 1Flexor digitorum superficialis. It has two heads, which arise from the medial epicondyle of the humerus and the shaft of the radius. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article