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.
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Fig 1 – Flexor digitorum superficialis. It has two heads, which arise from the medial epicondyle of the humerus and the shaft of the radius.