Which nerve innervates the flexor carpi radialis?

The flexor carpi radialis is primarily responsible for wrist flexion and radial deviation, which are crucial movements in the wrist. This muscle is innervated by the median nerve, which is one of the major nerves of the upper limb.

The median nerve originates from the brachial plexus and travels down the arm, providing innervation to several important muscles in the forearm and hand. Specifically, it supplies the flexor carpi radialis, as well as other muscles involved in flexion of the wrist and fingers. Proper function of the median nerve is essential for movements that involve gripping and manipulating objects.

In contrast, the other nerves listed play different roles. The ulnar nerve innervates the flexor carpi ulnaris and most intrinsic muscles of the hand, while the radial nerve primarily innervates extensor muscles in the posterior compartment of the arm and forearm. The musculocutaneous nerve mainly innervates flexor muscles in the anterior compartment of the arm, particularly the biceps brachii and brachialis, without involvement in wrist flexion. Therefore, the median nerve's specific role in innervating the flexor carpi radialis highlights its importance in wrist movements and hand function.