Figure 7. Schematic illustration indicating proposed functional roles of sural reflexes during walking.

A, swing phase in which knee flexion and ankle DF predominate. B, late stance in which hip and knee flexion as well as ankle DF are key features. C, net effect of lower leg responses during stance (large arrowhead), wherein MG and TA responses act in concert to evert (Ev) and DF the foot. The putative contributions of MG to PF, and Ev and TA to DF and inversion (In) are shown by the dotted lines. ⋆ Activation of the sural nerve cutaneous field.