Figure 5.

Setting a value of λ defines a dependence of muscle force on muscle length, F(L) shown as a thick dashed line, from a family of possible F(L) characteristics shown as thin dashed lines. As one moves along a specific F(L) curve from λ to the right, all the relevant afferent (e.g., Ia and Ib) and efferent (e.g., α and γ) signals increase.