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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.
Summary. 1  origin: medial epicondyle of the humerus. 2  insertion: palmar aponeurosis. 3  innervation: median nerve.  action: weak flexor of the wrist and elbow; tightens palmar aponeurosis during power grip.