Radial Nerve Overview | Branches & Functions

The video tutorial provides a comprehensive overview of the radial nerve, detailing its origin from the brachial plexus and its path through the posterior brachium and forearm. It explains the sensory and motor functions of the radial nerve's branches, including the superficial and deep radial nerves, and their roles in innervating muscles such as the triceps brachii, anconeus, brachioradialis, and various extensors. The tutorial also covers the transition of the deep radial nerve into the posterior interosseous nerve and its significance in forearm muscle innervation.

Which muscle is primarily responsible for elbow extension and also assists in shoulder extension?

• Brachioradialis

• Triceps brachii

• Extensor carpi radialis longus

• Anconeus

What is the primary function of the superficial branch of the radial nerve?

• Motor innervation to forearm muscles

• Sensory information from the hand

• Motor innervation to the triceps

• Sensory information from the shoulder

After bifurcation, what does the deep branch of the radial nerve become?

• Superficial radial nerve

• Posterior interosseous nerve

• Median nerve

• Ulnar nerve

Which muscle does the posterior interosseous nerve NOT innervate?

• Extensor digitorum

• Extensor carpi ulnaris

• Extensor pollicis longus

• Brachioradialis

What is the role of the extensor digitorum muscle?

• Flexion of the elbow

• Flexion of the wrist

• Extension of digits 2 through 5

• Abduction of the thumb

Which muscle is involved in both wrist extension and ulnar deviation?

• Extensor carpi ulnaris

• Extensor carpi radialis longus

• Extensor digiti minimi

• Supinator

What action does the abductor pollicis longus perform?

• Flexion of the thumb

• Extension of the index finger

• Abduction and extension of the thumb

• Flexion of the wrist