Radial Nerve Course and Root Value Quiz and Flashcards

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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?

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), except elbow extension is intact due to the long and medial heads of the triceps being supplied before the spiral groove. Signup and view all the answers

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