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Origin Humeroulnar head: medial epicondyle of humerus, ulnar collateral ligament, and coronoid process of ulna.

Radial head: superior half of anterior border of radius
Insertion Bodies of middle phalanges of fingers
Action Flexes middle phalanges at PIP joints of digits 2-5. Also flexes proximal phalanges at MCP joint.
Innervation Median nerve (C7, C8, T1)
Arterial Supply Ulnar artery

   
 

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