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  1. Nicolaus Copernicus, Polish astronomer
  2. Nerve demyelination, TEM
  3. Nerve cell, computer artwork
  4. Nerve cell, computer artwork
  5. Nerve cell, artwork
  6. Nerve cell, artwork
  7. Neck and facial nerves
  8. Muscles of the side and back
  9. Muscles of the hand and forearm
  10. Muscles of the foot
  11. Muscles of the back
  12. Muscles of lower leg
  13. Mendelian inheritance
  14. Medieval urine wheel
  15. Medical zodiac, 15th century diagram
  16. Lung blood vessels
  17. Lung anatomy, artwork
  18. Lower leg bones and ligaments
  19. Legend of Archimedes and the lever
  20. Knee replacement, artwork
  21. Joint pain, conceptual artwork
  22. Johannes Kepler and Tycho Brahe
  23. Johann Gutenberg, German inventor
  24. Intestinal villi, artwork
  25. Interior of human blood vessel showing a thrombus
  26. Instruments for removing bladder stones
  27. Insect microscopy, 19th century
  28. Illustration showing diverticulitis of the colon
  29. Illustration of syringe needle drawing blood lipid
  30. Illustration of septal cirrhosis of the liver
  31. Illustration of coronary artery atherosclerosis
  32. Illustration of a whiplash injury to the neck
  33. Illustration of a calculus or stone in the kidney
  34. Human skull
  35. Human skull
  36. Human skeleton
  37. Human nervous system, artwork
  38. Human nervous system, artwork
  39. Human lungs, artwork
  40. Human heart, artwork
  41. HIV virus particles, artwork
  42. Hipparchus, Ancient Greek astronomer
  43. Henri Poincare, French mathematician
  44. Heart disease, artwork
  45. Heart and neck blood vessels
  46. Heart and lungs
  47. Heart after heart attack
  48. Heart