5 Questions
Which nerve innervates the muscles in the posterior compartment of the forearm?
Radial nerve
How many muscles are there in the superficial layer of the posterior forearm?
Seven
Which muscle is a flexor at the elbow, despite having the characteristics of an extensor muscle?
Brachioradialis
Where are the radial artery and nerve sandwiched in the distal forearm?
Between the brachioradialis and the deep flexor muscles
Which muscles in the posterior forearm are situated on the lateral aspect and able to produce abduction as well as extension at the wrist?
Extensor carpi radialis longus and brevis
Study Notes
Posterior Forearm
- The posterior interosseous nerve innervates the muscles in the posterior compartment of the forearm.
- There are 3 muscles in the superficial layer of the posterior forearm.
Unique Muscle Characteristics
- Anconeus, a muscle in the posterior forearm, is a flexor at the elbow despite having the characteristics of an extensor muscle.
Radial Artery and Nerve
- The radial artery and nerve are situated between the tendons of the brachioradialis and extensor carpi radialis brevis muscles in the distal forearm.
Lateral Posterior Forearm Muscles
- The muscles in the posterior forearm that are situated on the lateral aspect and able to produce abduction as well as extension at the wrist are the abductor pollicis longus and extensor pollicis brevis.
Test your knowledge of the anatomy of the posterior compartment of the forearm, focusing on the attachments, actions, and innervation of the extensor muscles. This quiz will challenge your understanding of the deep and superficial layers of these muscles, as well as their clinical relevance.
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