Ace the 2026 Gross Anatomy Challenge – Master Block 2 and Flex Your Muscle Knowledge!

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The long thoracic nerve roots are which spinal cord levels?

C4, C5, and C6

C5, C6, and C7

The long thoracic nerve is formed by the ventral rami of C5, C6, and C7. This root pattern is what provides innervation to the serratus anterior, a muscle essential for stabilizing the scapula and enabling upward rotation of the arm. Therefore, the correct spinal levels are C5, C6, and C7. Variants that include C4 or C8 or omit one of these levels don’t match the nerve’s actual root contributions.

C6, C7, and C8

C5, C7, and C8

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