1. Introductory lecture: Muscle sense, proprioception and the control of movement. -- 2. The encoding of the receptor potential into impulse patterns of muscle spindle afferents of cats. -- 3. Impulse activity from human muscle spindles during voluntary contractions. -- 4. Impulse decoding process in stretch reflex. -- 5. Motoneuronal reflex response to vibration of the contracting muscle. -- 6. Physiological characteristics of the tonic and phasic motor units in human muscles. -- 7. Pyramidal and extra-pyramidal control on mammalian alpha motoneurones. -- 8. Supraspinal mechanisms of motor control. -- 9. Control of motor activity at the thalamic level of the cat. -- 10. Motor effects of stimulation of the cerebral cortex in the dog. An ontogenetic study. -- 11. On the neuromuscular origin of the physiological postural tremor. -- 12. On the spontaneous and induced body oscillations. -- 13. Muscle stiffness and motor control - forces in the ankle during locomotion and standing. -- 14. The control of posture and locomotion. -- 15. On the dynamic equilibrium of the pedatar systems.