The Radial Nerve [Part 2] | From Elbow → Hand

The video tutorial explains the radial nerve's origin from the brachial plexus, its path through the arm, and its bifurcation into the deep and superficial branches. The deep branch is motor-focused, entering the supinator tunnel and becoming the posterior interosseous nerve, innervating extensor muscles. The superficial branch is sensory, running under the brachioradialis and providing sensory input from the hand's lateral dorsal side.

Where does the radial nerve originate from?

• Anterior cord of the brachial plexus

• Posterior cord of the brachial plexus

• Lateral cord of the brachial plexus

• Medial cord of the brachial plexus

What are the two branches of the radial nerve after bifurcation?

• Superficial and deep branches

• Anterior and posterior branches

• Lateral and medial branches

• Proximal and distal branches

What is the function of the deep branch of the radial nerve?

• Purely sensory

• Autonomic

• Purely motor

• Mixed sensory and motor

What does the deep branch of the radial nerve become after passing through the supinator tunnel?

• Ulnar nerve

• Median nerve

• Posterior interosseous nerve

• Anterior interosseous nerve

Which muscles are primarily innervated by the posterior interosseous nerve?

• Flexor muscles of the forearm

• Extensor muscles of the forearm

• Intrinsic muscles of the hand

• Muscles of the upper arm

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

• Mixed function

• Motor function

• Sensory function

• Autonomic function

Which part of the hand does the superficial branch of the radial nerve provide sensory information for?

• Medial palmar half

• Lateral dorsal half

• Entire palmar surface

• Entire dorsal surface