Baxendale R H, Ferrell W R
Brain Res. 1980 Dec 8;202(2):497-500. doi: 10.1016/0006-8993(80)90163-8.
In the intact hindlimb, flexion reflexes are most easily obtained when the knee is extended. Movement of the knee joint after the muscles have been tenotomized and held at fixed lengths still modulates flexion reflex excitability. After anaesthesia of the joint capsule movement of the limb no longer affects flexion reflex excitability.
