Which trunk has root values C7?

Prepare for the Brachial Plexus Exam with flashcards and multiple choice questions; each question includes hints and explanations. Ace your test!

Multiple Choice

Which trunk has root values C7?

Explanation:
In the brachial plexus, trunks are formed from specific ventral rami: the upper trunk carries fibers from C5 and C6, the middle trunk carries C7 alone, and the lower trunk carries C8 and T1. Since the root value C7 is not part of the C5-C6 pair or the C8-T1 pair, it forms the middle trunk by itself. That’s why the trunk associated with C7 is the middle trunk. The other trunks involve different root values, so they don’t include C7.

In the brachial plexus, trunks are formed from specific ventral rami: the upper trunk carries fibers from C5 and C6, the middle trunk carries C7 alone, and the lower trunk carries C8 and T1. Since the root value C7 is not part of the C5-C6 pair or the C8-T1 pair, it forms the middle trunk by itself. That’s why the trunk associated with C7 is the middle trunk. The other trunks involve different root values, so they don’t include C7.

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