Integration of the central nervous system is essential for the proper motor response produced by the body. A good example of such integration is an everyday situation of a child playing in the garden barefoot until it steps on a piercing-cutting object. In this situation where the child is in the upright position two responses are expected: 1 – hip and knee flexion of the lower member that touched the object to avoid noxious stimulus. 2- Increase of the extension muscle tonus of the contralateral lower members in order to compensate the imbalance provoked by injured foot flexion.