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Radial Nerve Anatomy Quiz

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Questions and Answers

What is the root value of the radial nerve?

C5, C6, C7, C8, T1 (correct)

C6, C7, C8

C7, C8, T1

C5, C6, C7

Where does the radial nerve descend in the axilla?

Between the axillary artery and teres major muscle

Between the axillary artery and latissimus dorsi muscle

Between the axillary artery and subscapularis muscle (correct)

Between the axillary artery and pectoralis minor muscle

Where does the radial nerve run in the spiral groove of the humerus?

With the profunda brachii artery (correct)

With the ulnar nerve

With the median nerve

With the brachial artery

Which structure does the radial nerve pierce in the middle of the arm to enter the anterior compartment?

Lateral intermuscular septum Signup and view all the answers

What are the two terminal branches of the radial nerve in the cubital fossa?

Superficial radial nerve and posterior interosseous nerve Signup and view all the answers

What is the course and relation of the posterior interosseous nerve?

It pierces the supinator, turns around the lateral side of the radius, and runs between the superficial and deep extensors, supplying all muscles of the back of the forearm except brachioradialis, extensor carpi radialis longus, and anconeus. Signup and view all the answers

What is the effect of an injury to the radial nerve in the axilla?

Paralysis of the triceps and anconeus, leading to loss of elbow extension (elbow drop), paralysis of wrist extensors, leading to loss of wrist extension (wrist drop), and paralysis of finger extensors, leading to loss of finger extension (finger drop). Signup and view all the answers

What is the effect of an injury to the radial nerve in the spiral groove?

What is the effect of an injury to the superficial radial nerve?

Loss of sensation in the back of the lateral 2/3 of the hand and proximal phalanx of the lateral 3.5 fingers. Signup and view all the answers

What is the course and relation of the radial nerve in the forearm?

It descends vertically in the lateral side of the forearm, deep to the brachioradialis, and about 5 cm above the wrist, it turns backwards to run in the roof of the anatomical snuff box, where it divides into 5 dorsal digital branches to supply the dorsum of the lateral 2/3 of the hand and the proximal phalanx of the lateral 3.5 fingers. Signup and view all the answers

Study Notes

Radial Nerve Course and Relations

Descends vertically in the lateral side of the forearm, deep to brachioradialis, 5 cm above the wrist
Turns backwards to run in the roof of the anatomical snuffbox, where it divides into 5 dorsal digital branches

Radial Nerve Distribution

Supplies the dorsum of the lateral 2/3 of the hand and the proximal phalanx of the lateral 3 1/2 fingers

Posterior Interosseous Nerve

Pierces the supinator, turns around the lateral side of the radius to the back of the forearm
Appears between the supinator and the abductor pollicis longus
Runs superficial and deep to the extensors, then to the extensor pollicis longus and interosseous membrane
Ends deep to the extensor retinaculum

Branches in the Forearm

2 post-interosseous nerves
Superficial radial nerve (dorsal digital branches)
Post-interosseous nerve (motor course)

Effects of Injury

Axilla Injury

Paralysis of triceps and anconeus leading to loss of elbow extension (elbow drop)
Paralysis of wrist extensors leading to loss of wrist extension (wrist drop)
Paralysis of fingers extensors leading to loss of fingers extension (fingers drop)

Spiral Groove Injury

Motor effects: same as axilla injury, except elbow extension is intact due to long and medial heads of triceps
Fingers drop due to paralysis of fingers extensors

Superficial Radial Nerve Injury

Loss of sensation in the back of the lateral 2/3 of the hand and proximal phalanx of lateral 3.5 fingers

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Description

Test your knowledge on the anatomy of the radial nerve, including its origin, root value, and course through the axilla and arm. Explore the details of this important branch of the brachial plexus.