Opponens pollicis muscle

The opponens pollicis muscle is a muscle in the hand that flexes and medial|medially rotates the thumb, bringing it in front of the palm.

Origin
The opponens pollicis muscle originates from the base of the hand below the thumb, at the flexor retinaculum and the tubercle of the trapezium bone.

Insertion
The opponens pollicis muscle inserts on the thumb at the first metacarpal bone.

Action
The opponens pollicis muscle flexes and medial|medially rotates the thumb at the carpometacarpal and metacarpophalangeal joints.

Innervation
The opponens pollicis muscle is innervated by the recurrent branch of the median nerve (C8 and T1).