Muscles of the Posterior Forearm – Deep View

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The muscles of the posterior forearm seen in this deep view are the:

• • • Abductor pollicis longus
    • Extensor pollicis brevis
    • Extensor pollicis longus
    • Extensor indicis
    • Supinator

Also seen are the:

• Brachioradialis
• Extensor carpi radialis longus (cut)
• Extensor carpi radialis brevis (cut)

Notes:

• • • The abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, and extensor indicis are member of the deep distal four group of the posterior forearm.
    • The supinator is deep in the proximal posterior forearm.
    • The abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus all attach onto and move the thumb (“pollicis” means “thumb”).
    • The extensor indicis attaches onto and moves the index finger.
    • The abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, and extensor indicis also cross the wrist joint.
    • The supinator crosses the radioulnar joints and supinates the forearm.
    • The anatomic snuffbox is located between the distal tendons of the extensor pollicis brevis and extensor pollicis longus.

The muscles of the posterior right-side forearm seen in this deep view are the abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, extensor indicis, and the supinator.