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6mm (1.8 mm), DSN origin to C5 root origin 23.3 mm (2.2 mm), DSN origin to the posterior foraminal tubercle 2.3 mm (2.5 mm) proximal/intraforaminal (first branch from C5 in all cases, and the majority [12 of 18, 67%] of DSNs originating from the C5 spinal nerve root within the foramen). The C5 nerve root contributed to the DSN in all specimens that originated from the proximal, intraforaminal, C5 nerve root in the majority of specimens. As the first C5 nerve branch, surgeon knowledge of this proximal DSN pattern will help localize lesion