Which spinal nerves contribute to the brachial plexus?

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The question asks which spinal nerves contribute to the brachial plexus, so we must identify the nerve roots involved.
Option A: C1-C5. This range includes C1 and C2, which do not contribute to the brachial plexus. The plexus is formed from C5 through T1, so this option omits part of the required roots and includes an irrelevant one.
Option B: L1-L5. These are lumbar nerves, not cervical/thoracic nerves. They form the lumbar plexus and sacral plexus components for the lower limb, not the upper limb.
Option C: S1-Co1. This range is sacral and coccygeal nerves, which contribute to pelvic and lower limb innervation, not to the brachial plexus.
Option D: C5-T1. This is the classic range of nerve roots that give rise to the brachial plexus, specifically the five roots: C5, C6, C7, C8, and T1. These roots combine to form trunks, divisions, cords, and branches that supply the upper limb.
Option E: T1-T6. Although T1 is included in the brachial plexus, the inclusion of T2 through T6 is incorrect; the plexus does not extend through T6, and those levels are not part of its root contribution. This makes the option misleading or incorrect as a whole.

BIOLOGY 211-B09C Practice Exam 2

Which spinal nerves contribute to the brachial plexus?

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