central nervous system
neurons
synapse
peripheral nervous system
somatic nervous system
neurotransmitter
autonomic nervous system
hindbrain
forebrain
MRI
EEG
midbrain
forebrain
corpus callosum
thyroid gland
adrenal gland
endocrine system
pituitary gland
adrenal
hyperthyroidism
estrogen and progesterone
genes
nature vs. nurture
fraternal twins
monozygotic