The opponens pollicis is a thenar muscle located within the hand. It is the largest of the thenar muscles, and is located underneath the flexor pollcis brevis and abductor pollicis brevis. Attachments: Originates from the tubercle of the trapezium and the associated flexor retinaculum. Inserts onto the lateral margin of the first metacarpal. Actions: Opposition of the thumb Innervation: Median nerve (recurrent branch) Blood supply: Superficial palmar arch By TeachMeSeries Ltd (2025) Figure 1Palmar view of the thenar muscles. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article