Radial Nerve Function: Innervation of the Triceps Brachii Muscle

Radial nerve A. provides motor innervation to the biceps brachiiB. innervates two forearm muscles plus most of the intrinsic hand musclesC. innervates all but one of the flexor muscles of the forearm and most of the hand muscles near the thumbD. innervates the deltoid and teres minor musclesE. innervates the triceps brachii

E. innervates the triceps brachii

E. Innervates the triceps brachii.

The radial nerve is a major nerve in the arm that arises from the brachial plexus and provides motor and sensory innervation to the upper limb. The radial nerve primarily innervates the extensor muscles of the forearm, including the triceps brachii muscle.

Option A is incorrect because the biceps brachii muscle is innervated by the musculocutaneous nerve, not the radial nerve.

Option B is incorrect because while the radial nerve does innervate two forearm muscles (brachioradialis and extensor carpi radialis), it does not innervate most of the intrinsic hand muscles. The intrinsic hand muscles are primarily innervated by the ulnar nerve and median nerve.

Option C is also incorrect because the radial nerve does not innervate all of the flexor muscles of the forearm or hand muscles near the thumb. The flexor muscles of the forearm are innervated by the median and ulnar nerves, and the hand muscles near the thumb are innervated by the median nerve.

Option D is incorrect because the deltoid and teres minor muscles are innervated by the axillary nerve, not the radial nerve.

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