Flexor digitorum superficialis m

The FDs is the more superficial of the digital flexors.  It originates from the medial epicondyle of the humerus, its 4 tendons pass through the carpal tunnel, and they insert into the middle phalanges of digits 2-5.  It is innervated by the median n.  Because the muscle tendons cross the wrist, MCP, and the proximal IP joints, it flexes all those joints.