Figure 6. Dependence of pre/postinspiratory lumbar nerve bursting on rostral boundary of brainstem–spinal cords.

A, a BSC[+0.58]W–P1 preparation generated stable inspiratory C₄ bursting, but did not show respiratory-related activity in the first ventral lumbar (L₁) root. B, pre/postinspiratory L₁ bursting was revealed in a BSC[+0.67]W–P0. C, plot of the occurrence (^) or absence (•) of lumbar pre/postinspiratory rhythm vs. the rostral boundary. Grey area indicates the rostrocaudal extension of VII (compare Fig. 1).