2. neuron 27. pituitary gland 52. Broca's area
3. sensory neurons 28. lesion 53. Wernicke's area
4. motor neurons 29. electroencephalogram 54. plasticity
5. interneurons 30. CT scan 55. neurogenesis
6. dendrite 31. PET scan 56. corpus callosum
7. axon 32. MRI 57. split brain
8. myelin sheath 33. fMRI 58. consciousness
9. action potential 34. brainstem 59. cognitive neuroscience
10. threshold 35. medulla 60. dual processing
11. synapse 36. reticular 61. behavior genetics
12. neurotransmitters 37. thalamus 62. environment
13. reuptake 38. cerebellum 63. chromosomes
14. endorphins 39. limbic system 64. DNA
15. nervous system 40. amygdala 65. genes
16. central nervous system 41. hypothalamus 66. genome
17. peripheral nervous system 42. cerebral cortex 67. identical twins
18. nerves 43. glial cells 68. fraternal twins
19. somatic nervous system 44. frontal lobes 69. heritability
20. autonomic nervous system 45. parietal lobes 70. molecular genetics
21. sympathetic nervous system 46. occipital lobes 71. natural selection
22. parasympathetic nervous system 47. temporal lobes 72. evolutionary psychology
23. reflex 48. motor cortex
24. endocrine system 49. sensory cortex
25. hormones 50. association areas