12 Questions
Which nerve branch is supplied by the median nerve?
Superficial branch
Where does the superficial branch of the radial nerve supply?
Lateral 2/3 of the dorsum of the hand
Which muscle is NOT supplied by the deep terminal branch of the radial nerve?
Brachioradialis
What is a common cause of radial nerve compression leading to triceps paralysis?
Compression from crutch palsy
Where does the deep terminal branch of the radial nerve pass through to reach the posterior compartment of the forearm?
Through supinator muscle
Which muscle is NOT supplied by the superficial branch of the radial nerve?
Supinator
Which part of the brachial plexus does the radial nerve originate from?
Posterior cord
Where does the radial nerve descend behind the arteries in the arm?
3rd part of axillary artery
What is the terminal branch of the radial nerve that passes through the supinator muscle to reach the back of the forearm?
Posterior interosseous nerve
Which muscle does the radial nerve pass between before terminating in front of the lateral epicondyle?
Brachioradialis
What are the root values of the radial nerve?
C5, C6, C7, C8, T1
Which structure does the radial nerve pierce to descend to the front of the lateral epicondyle?
Lateral intermuscular septum
Study Notes
Radial Nerve
- The median nerve does not supply the thenar muscles, but rather the lateral aspect of the hand.
- The superficial branch of the radial nerve supplies the lateral dorsal aspect of the hand.
- The deep terminal branch of the radial nerve does not supply the brachialis muscle.
- A common cause of radial nerve compression leading to triceps paralysis is Saturday night palsy.
Radial Nerve Anatomy
- The deep terminal branch of the radial nerve passes through the supinator muscle to reach the posterior compartment of the forearm.
- The deep terminal branch of the radial nerve is also known as the posterior interosseous nerve.
- The radial nerve originates from the posterior cord of the brachial plexus.
Radial Nerve Pathway
- The radial nerve descends behind the brachial artery in the arm.
- The terminal branch of the radial nerve that passes through the supinator muscle is the posterior interosseous nerve.
- The radial nerve passes between the brachialis and brachioradialis muscles before terminating in front of the lateral epicondyle.
- The radial nerve pierces the lateral intermuscular septum to descend to the front of the lateral epicondyle.
Radial Nerve Composition
- The root values of the radial nerve are C5-C8 and T1.
Test your knowledge on the origin, course, branches, and effects of injury of the radial nerve, as well as the segmental innervation and dermatomes of the upper limb. This quiz is based on Lecture 12 by Dr. Talaat Moustafa and references Snell’s Clinical Anatomy by Regions (10th ed.).
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