Opponens Pollicis Muscle

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** A muscle that originates on the distal border of the flexor retinaculum and the tubercles of the scaphoid and trapezium, and inserts into the lateral aspect of the first metacarpal; it is involved in the rotation and flexion of the thumb and is supplied by the recurrent branch of the medial nerve and the superficial palmar branch of the radial artery.

**Synonyms:** - OPPONENS POLLICIS MUSCLE