Ulnar Nerve

The ulnar nerve, receiving fibers from C8 and T1, courses anterior to the triceps muscle and then dives into the medial intermuscular septum. It then proceeds posterior to the medial epicondyle (Fig. 2). At this point, the nerve lies in a superficial position and is susceptible to trauma. The nerve is also vulnerable to compression in the cubital tunnel, which is composed of a tendinous arch joining the humeral and ulnar heads. The nerve then enters the forearm and supplies the flexor carpi ulnaris and half of the flexor digitorum profundus

FIGURE 1 ■ The brachial plexus.

FIGURE2 ■ Ulnar nerve running posterior to medial epicondyle.

FIGURE 1 ■ The brachial plexus.

FIGURE3 ■ Sensory innervation of the upper extremity.

FIGURE2 ■ Ulnar nerve running posterior to medial epicondyle.

muscles. Its cutaneous innervation provides sensation to the fifth digit and half of the fourth digit along with sensation to that part of the hand (Fig. 3).

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