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Questions and Answers
Which nerve branch is supplied by the median nerve?
Which nerve branch is supplied by the median nerve?
- Deep branch (posterior interosseous)
- Branch to brachialis
- Superficial branch (correct)
- Nerve to ECRL
Where does the superficial branch of the radial nerve supply?
Where does the superficial branch of the radial nerve supply?
- Lateral 2/3 of the dorsum of the hand (correct)
- Anterior compartment of forearm
- Medial head of triceps
- Posterior compartment of forearm
Which muscle is NOT supplied by the deep terminal branch of the radial nerve?
Which muscle is NOT supplied by the deep terminal branch of the radial nerve?
- Extensor carpi radialis brevis
- Extensor digitorum
- Brachioradialis (correct)
- Extensor carpi ulnaris
What is a common cause of radial nerve compression leading to triceps paralysis?
What is a common cause of radial nerve compression leading to triceps paralysis?
Where does the deep terminal branch of the radial nerve pass through to reach the posterior compartment of the forearm?
Where does the deep terminal branch of the radial nerve pass through to reach the posterior compartment of the forearm?
Which muscle is NOT supplied by the superficial branch of the radial nerve?
Which muscle is NOT supplied by the superficial branch of the radial nerve?
Which part of the brachial plexus does the radial nerve originate from?
Which part of the brachial plexus does the radial nerve originate from?
Where does the radial nerve descend behind the arteries in the arm?
Where does the radial nerve descend behind the arteries in the arm?
What is the terminal branch of the radial nerve that passes through the supinator muscle to reach the back of the forearm?
What is the terminal branch of the radial nerve that passes through the supinator muscle to reach the back of the forearm?
Which muscle does the radial nerve pass between before terminating in front of the lateral epicondyle?
Which muscle does the radial nerve pass between before terminating in front of the lateral epicondyle?
What are the root values of the radial nerve?
What are the root values of the radial nerve?
Which structure does the radial nerve pierce to descend to the front of the lateral epicondyle?
Which structure does the radial nerve pierce to descend to the front of the lateral epicondyle?
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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.
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