The Hip: Preservation, Replacement and Revision

Opponens Pollicis 



- Origin:     flexor retinaculum and tubercle of trapezium bone;
- Insertion:  radial side of entire length of first metacarpal bone;
- Action:     flexes & abducts first metacarpal w/ medial rotation at hand;
- Synergists: abductor pollicis,  adductor pollicis;
- Nerve:        Median, C8 > T1;

- Discussion:
    - opponens pollicis winds around a part of the 1st metacarpal;
    - this muscle lies under the abductor brevis and acts primarily as internal rotator and stabilizer of the 1st metacarpal;
- Exam:
    - abductor pollicis & opponens pollicis pronate or oppose thumb & can be evaluated by asking pt to touch thumb & small fingertips
            together so that the nails are parallel;
    - can also be tested by asking pt to place dorsum of hand flat on table & raise thumb up straight to form 90 deg angle with the palm;
            - one must palpate the thenar muscle and ensure that it is contracting



Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Tuesday, April 10, 2012 3:50 pm