MR lumbar spine axial - labeling questions

The labeled structures are (excluding the correct side):

1. left common iliac artery

2. posterior epidural space containing fat

3. inferior vena cava

4. L2/3 facet joint

5. right common iliac artery

6. pedicle of L3

7. segmental medullary vessels

8. cauda equina

9. right descending L4 nerve root

10. dural sac

11. posterior longitudinal ligament

12. subcutaneous fat

13. anterior longitudinal ligament

14. ligamentum falvum

15. psoas major muscle

16. spinous process of L3

17. transverse process of L4

18. vertebral body of L4

19. right descending L5 nerve root

20. quadratus lumborum muscle

21. left exiting L4 nerve root

22. lamina of L4

23. annulus fibrosus of L4/5 intervertebral disc

24. nucleus pulposis of L4/5 intervertebral disc

25. lumbar cistern containing CSF

26. anterior epidural space containing fat

27. erector spinae muscles

28. dorsal root ganglion of left exiting L5 nerve root

29. iliolumbar ligament

30. iliac crest

31. interspinous ligament

32. vertebral body of L5

33. right exiting L5 nerve root

34. L5/S1 intervertebral (neural) foramen containg fat

35. epidural space containing fat

36. thoracolumbar fascia

37. extraforminal sesgment of right L5 nerve root

38. sacral ala

39. posterior sacroiliac ligament

40. dorsal root ganglion of left S1 nerve root

41. right S2 nerve root

42. sacral promontory

43. sacroiliac joint

44. iliacus muscle

45. left internal iliac vein

46. right external iliac artery

47. left internal iliac artery

48. right S2 nerve root

49. left second sacral foramen containing fat

The same normal L spine MR without labels for reference.