Stretch reflex: information about stretch and length changes in muscle in transmitted via primary (type Ia) and secondary (type II) afferent fibers to CNS. These fibers also synapse on the alpha or gamma motoneurons and facilitate contraction of extrafusal and intrafusal fibers and inhibit the muscle’s antagonists.Lengthening of the muscle t stimulate the sensory fibersGamma efferent neural pathways to stimulate contraction of the intrafusal fibers