I Spinal Mechanisms of Stepping and Scratching Movements.- 1. Crucial Role of the Spinal Cord in Control of Stepping and Scratching Movements.- 2. Preparations and Evoking of Movements.- 3. Hindlimb Movements and Muscle Activity.- 4. Role of Central Mechanisms and Afferent Signals in Generating Rhythmic Movements.- 5. Afferent Signals.- 6. Localization of the Rhythm Generator. Activity of Neurons of the “Leading” Region of the Lumbo-Sacral Spinal Cord.- 7. Conclusion.- II Signals Coming to the Cerebellum.- 1. Cerebellar Cortex and its Afferent Connections.- 2. Dorsal Spino-Cerebellar Tract.- 3. Ventral Spino-Cerebellar Tract.- 4. Spino-Reticulo-Cerebellar Pathway.- 5. VSCT and SRCP convey Messages about Activity in the “Leading” Region of Lumbo-Sacral Cord.- 6. Spino-Olivo-Cerebellar Pathway.- 7. Conclusion.- III Signals Conveyed by Descending Tracts.- 1. Vestibulo-Spinal Tract.- 2. Reticulo-spinal Tract.- 3. Rubro-Spinal Tract.- 4. Influences of Descending Tracts upon Motor Activity.- 5. Conclusion.- IV Role of Different Input Signals for Generating Cerebellar Output Signals.- 1. Role of Signals Concerning Peripheral and Central Processes During Locomotion.- 2. Role of Signals Concerning Peripheral and Central Processes During Scratching.- 3. Role of Signals Coming via VSCT and SRCP.- 4. Conclusion.- V Activity of Cerebellar Neurons.- 1. Purkinje Cells.- 2. Fastigial Nucleus.- 3. Interpositus Nucleus.- 4. Lateral Nucleus.- 5. Conclusion.- VI External Inputs of the Spino-Cerebellar Loop.- VII Role of the Cerebellum in the Control of Locomotion and Scratch Reflex.- References.