The size of a nerve root varies depending on its location in the spinal column. For example, the largest cervical nerve roots (dorsal) measure around 4.61 ± 0.87 mm in diameter at C7, while the largest dorsal roots from T1 to S5 are found at S1, measuring approximately 2.95 ± 0.57 mm.
Here's a more detailed breakdown:
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Cervical Nerve Roots: The diameter is largest at C7, measuring around 4.61 ± 0.87 mm.
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Thoracic and Sacral Nerve Roots: From T11 to S1, the diameter of dorsal roots increases, then gradually decreases from S1 to S5. The largest diameter in this region is at S1 (2.95 ± 0.57 mm), and the smallest is at S5 (0.27 ± 0.13 mm).
In summary, nerve root size is not uniform and varies significantly along the spinal column, with cervical nerve roots generally being larger than sacral nerve roots.
