Fig. 4

Comparison of LBAS density at different levels of the spinal cord. The degree of LBAS among four different segments (cervical, thoracic, lumbar, and sacral) in three different regions (dorsal horn, ventral horn, and intermediate zone) of the spinal gray matter showed a caudo–rostral gradient in which the greatest was at the sacral level followed by the lumbar, thoracic, and cervical levels. a Dorsal horn (Rexed lamina I–VI, n = 256). b Ventral horn (Rexed lamina VIII–IX, n = 258). c Intermediate zone (Rexed lamina VII and X, n = 258). * P < 0.01