1. Control of Motor Movement Dr.Mohammed Sharique Ahmed Quadri Assistant Professor Department Basic Medical Sciences Division of Physiology Faculty of Medicine Almaarefa Colleges

2. Control of Motor Movement 3 levels of input control motor-neuron output – Input from afferent neurons – Input from primary motor cortex – Input from brain stem

3. The conceptual hierarchical organization of the neural system controlling body movements

5. The conceptual motor control hierarchy for voluntary motor movements

6. Local control of motor neurons

7. Length monitoring system Tension monitoring system

8. Muscle Spindle Structure Consist of collections of specialized muscle fibers known as intrafusal fibers – Lie within spindle-shaped connective tissue capsules parallel to extrafusal fibers – Each spindle has its own private efferent and afferent nerve supply – Play key role in stretch reflex

10. Stretch Reflex Primary purpose is to resist tendency for passive stretch of extensor muscles by gravitational forces when person is standing upright Classic example is patellar tendon, or knee- jerk reflex

12. Coactivation of Alpha & Gamma Motor Neurons

13. Patellar Tendon Reflex( knee jerk)

14. Patellar Tendon Reflex knee jerk)

16. Neural pathways underlying Golgi tendon organ component of local control system

17. References Human physiology by Lauralee Sherwood, 7 th edition Text book physiology by Guyton &Hall,12 th edition Text book of physiology by Linda.s contanzo,third edition 17