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ORIGIN Common extensor origin on anterior aspect of lateral epicondyle of humerus. INSERTION Extensor expansion of little finger-usually two tendons which are joined by a slip from extensor digitorum at metacarpophalangeal joint.RIGIN Common extensor origin on anterior aspect of lateral epicondyle of humerus. INSERTION Extensor expansion of little finger-usually two tendons which are joined by a slip from extensor digitorum at metacarpophalangeal joint.
Common Extensor Tendon Injuries. 1  Mallet Finger refers to a drooping end-joint of a finger. 2  BoutonniÃ¨re Deformity describes the bent-down (flexed) position of the middle joint of the finger. 3  Cuts on the back of the hand can injure the extensor tendons.