Describe how the nervous system develops (proliferation, migration, circuit formation, circuit pruning, myelination) and then further expand on the following CNS structures: brain (hemispheres and cortex) and spinal cord. What do localization studies show us about brain function (see: principles of human brain organization derived from split-brain studies and other resources on localization). Reflect on how the meninges and the cerebrospinal fluid protect the brain from trauma. What role does the blood-brain barrier play in blocking toxins and blood-borne neurotransmitters from entering the brain?