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