BIOM20002 Lecture Notes - Lecture 23: Lumbricals Of The Hand, Ulna, Carpal Tunnel

• School: University of Melbourne
• Department: Biomedicine
• Course: BIOM20002
• Professor: All

Document Summary

Posterior compartment muscles: wrist and finger extensors muscles in 2 layers: superficial and deep (don"t need to learn all the muscles) Brachioradialis does not cross wrist main action at elbow. 3 muscles extend wrist: extensor carpi radialis longus (ecrl) extensor carpi radialis brevis (ecrb) extensor carpi ulnaris (ecu) 2 muscles extend digits: extensor digitorum communis (edc) extensor digiti minimi (edm): extends little finger long muscles arise from common extensor origin (ceo) tendons pass under the extensor retinaculum. Deep layer: supinator abductor pollicis longus (apl)*: long muscle for thumb extensor pollicis brevis (epb)*: short muscle for thumb extensor pollicis longus (epl)* extensor indicis (ei): for index finger. Much harder to independently extend middle and ring finger because they don"t have their own extensor arise from ulna, radius and interosseous membrane. Synergistic action of long flexor & extensor tendons maintains optimal length-tension relationships. We use antagonists in our arm to extend wrist.