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THE CENTRAL NERVOUS SYSTEM Consists of the brain and spinal cord. The brain is protected by the cranium and the spinal cord is protected by the vertebrae. Both are also protected by membranous coverings called the meninges and are bathed in cerebrospinal fluids. The brain carries out most of the functions for the body while the spinal cord acts more like a liaison between the body and the brain. Most information is brought to the brain by moving up the neurons of the spinal cord. The spinal cord does, however, perform many reflex reactions. Both the brain and spinal cord are made up of both myelinated and unmyelinated neurons. The cerebral cortex of the brain has 2 hemispheres and four lobes (See other class worksheets). Each hemisphere of the brain has certain characteristics associated with it (logic, creativity etc – see other notes). The two sides talk to each other using neurons in between the two sides called the corpus callosum. Primary projection areas: Areas of the brain dedicated to processing vision, touch and hearing stimuli. The brain has 3 primary projection areas – Where are they located? 1. Vision = 2. Tactile/touch = 3. Auditory = Association areas – deal with language and speaking 1. Broca’s area gives you the ability to talk or speak 2. Wernicke’s area gives you the ability to understand language and put together meaningful sentences.