Which nerve roots contribute to the radial nerve?

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Multiple Choice

Which nerve roots contribute to the radial nerve?

Explanation:
Radial nerve fibers come from all five roots of the brachial plexus—C5, C6, C7, C8, and T1—through the posterior cord, which gathers inputs from the posterior divisions of the upper, middle, and lower trunks. So the radial nerve carries contributions from C5 to T1. That’s why the full range C5–T1 is the correct match. The other options miss some of these roots or include a root (like C4) that doesn’t contribute to the radial nerve.

Radial nerve fibers come from all five roots of the brachial plexus—C5, C6, C7, C8, and T1—through the posterior cord, which gathers inputs from the posterior divisions of the upper, middle, and lower trunks. So the radial nerve carries contributions from C5 to T1. That’s why the full range C5–T1 is the correct match. The other options miss some of these roots or include a root (like C4) that doesn’t contribute to the radial nerve.

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