Flexor Digitorum Superficialis
Forearm & Wrist
Splits around flexor digitorum profundus tendons at the fingers — its tendons are forked so the deeper profundus tendons can pass through, like a split rail fence.
Function
Flexes PIP joints; assists MCP/wrist flexion
Origin
Medial epicondyle, coronoid process, and anterior radius
Insertion
Shafts of middle phalanges digits 2-5
Innervation
Median nerve (C7-T1)