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Forearm - Anterior, Deep
Flexor digitorum superficialis
- Originates on the medial epicondyle of the humerus, the coronoid process of the ulna, and the radius (specifically, from the oblique line).
- Inserts, via split tendons, to the middle phalanges of digits 2-5.
- Flexes middle phalanges and metacarpophalangeal joints of digits 2-5 and the carpals.
- Originates on the ulna and the interosseous membrane.
- Inserts on distal phalanges of digits 2-5.
- Flexes digits 2-5 at the distal phalanges and metacarpophalangeal joints and also the wrist (which the tendons cross).
- Originates on the radius and the interosseous membrane.
- Inserts on the distal phalanx of digit 1.
- Flexes digit 1 at the distal phalanges and metacarpophalangeal joints and also the wrist (which the tendons cross).
- Originates on the distal ulna (specifically, the anteromedial aspect)
- Inserts on the distal radius (on the anterolateral aspect)
- Pronates the forearm (turns the palms face down).