Flexor Digitorum Superficialis
Origin = (this muscle has three heads)
Humeral head - Medial epicondyle of the humerus by means of the common tendon.
Ulnar head - Medial aspect of the coronoid process.
Radial head - Oblique line of the radius.
Insertion = Sides of the base of the middle phalanges of the four fingers by four tendons.
Action = Flexion of the four fingers at the metacarpophalangeal and proximal interphalangeal joints; assistive in flexion of the wrist joint.