Brachial Plexus Practice Test

Which nerve has root contributions of C8-T1?

Ulnar nerve Radial nerve Median nerve Musculocutaneous nerve

Correct Answer:

Ulnar nerve

Explanation:

Root levels feeding a peripheral nerve reveal how high or low in the plexus the fibers come from. The ulnar nerve is formed from the medial cord, which carries fibers from the lower trunk, specifically C8 and T1. That makes its primary root contributions C8-T1. In contrast, the radial nerve comes from the posterior cord with roots spanning C5 through T1; the median nerve comes from both the lateral and medial cords, also overall C5 through T1; and the musculocutaneous nerve comes from the lateral cord with roots C5-C7. So, while other nerves may receive some C8-T1 fibers, their overall root sets extend beyond C8-T1, whereas the ulnar nerve is characteristically C8-T1.

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