3. Brain stem 1- Medulla oblongata 2- Pons 3- Mid brain

4. Bulb of the brain

5. borders Medullopontine sulcus c1

6. Height and wide 3 cm 2 cm

7. Medulla division ` Lower closed part upper open part

8. External surface Fissure, sulcus, tubercle

9. Fissure, sulcus,

10. Ant. Region Lat. Region Post. Region

11. Causes of tubercles  1- pyramid  2- olive  3- gracilis  4- cuneatus  5- terigeminal

16. Spinomedullary junction 1- Separation of ant horn 2- Diverge of posterior horn, and appearance of three nuclei 3- Appearance of Forth ventricle

18. Nuclei of spinomedullary junction 1- spinal nucleus of accessory nerve 2- supraspinal nucleus 3- gracilis nucleus 4- cuneatus nucleus 5- spinal nucleus of trigeminal nerve

21. Nuclei in the closed and open parts of medulla oblongata 1- somatosensory nuclei 1- somatosensory nuclei 2- rely nuclei to the cerebellum 2- rely nuclei to the cerebellum 3- nuclei of cranial nerves 3- nuclei of cranial nerves

23. 1- somatosensory nuclei 1- Gracilis nucleus 2- Cuneatus nucleus 3- Spinal nucleus of trigeminal nerve 4- Nucleus z

24. 2- rely nuclei to the cerebellum 1- inferior oilvary complex nuclei 2- accessory cuneatus (lat/ext cuneatus)or Monakow 3-arcuate nucleus

25. 1- inferior oilvary complex nuclei

27. 3-arcuate nucleus

30. 3- nuclei of cranial nerves 1-Hypoglossal nucleus 2-Dorsal nucleus of vagus 3-Ambigus nucleus 4-Vestibular nuclei 5-Coclear nuclei (dorsal and ventral) 6-Solitary nucleus

31. 1-Hypoglossal nucleus

33. 2-Dorsal nucleus of vagus

35. 3-Ambigus nucleus

36. Ambigus nucleus

38. 4-Vestibular nuclei

39. 5-Coclear nuclei (dorsal and ventral)

41. Solitary nucleus

42. Non- Gustatory 9 - 10

43. Inferior salivatory nucleus

44. Glossopharyngeal nerve