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M. opponens pollicis
The muscle that brings the thumb into opposition
Origin: tuberculum ossis trapezii and retinaculum flexorum
Insertion: radial edge of the os metacarpale I
Innervation: Nervus medianus from Plexus brachialis from C6 to C8 or C8 to Th1 (inconsistant in literature)
Antagonists:
Movement: Adduction and opposition of the thumb