The Golgi tendon organ and the muscle spindle.
D000818:Animals; D002490:Central Nervous System / Q000502:physiology; D006801:Humans; D008465:Mechanoreceptors / Q000033:anatomy & histology / Q000502:physiology*; D008959:Models, Neurological; D009119:Muscle Contraction; D009470:Muscle Spindles / Q000033:anatomy & histology / Q000502:physiology*; D009434:Neural Pathways; D009475:Neurons, Afferent; D009476:Neurons, Efferent; D012026:Reflex, Stretch; D013710:Tendons / Q000294:innervation*