1. Ascending and Descending Tracts SMS 1084 Dr. Mohanad R. Alwan

4. CENTRAL NERVOUS SYSTEM integration / processing / modulating stimulus receptor neurone motor / descending tracts effector organ / response PNS transmission lower motor neurone sensory / ascending tracts

6. Ascending Sensory Pathway are organized in three neuronal chain - First order neurone - Second order neurone - Third order neurone

8. dorsal root dorsal root ganglion spinal nerve dorsal horn FIRST ORDER NEURON

12. ascending sensory pathway ( in general form ) from sensory endings to cerebral cortex ( note the three neurons chain )

13. ascending tracts in spinal cord

17. pain and temperature pathways

19. Touch and pressure pathways

21. muscle joint sense pathways to cerebellum

23. Spinotectal tract Spinoreticular tract Spino-oloivary tract

25. motor homunculus cerebral cortex

30. cerebral cortex – midbrain - pons - medulla oblongata descending tracts LMN sensory inputs

33. motor decussation medulla oblongata

34. Corticospinal Tract for fine skilled movements

42. Reticulospinal Tract

43. Thank You