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Chapter 4

Chapter 4 Notes

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CHAPTER 4 NOTES The human brain is the only object capable of studying itself. The Brain and its Components The brain consists of anywhere between 10 billion and 100 billion nerve cells. The nerve cells of the brain are indeed organized in modules-clusters of nerve cells that communicate with each other. Modules are also connected to each other. Structure of the Nervous System The brain has three major functions: controlling behaviour, processing and retaining the information we receive from the environment, and regulating the bodys physiological processes. The nervous system consists of two divisions. The brain and the spinal cord make up the central nervous system. The spinal cord is a long, thin collection of nerve cells attached to the base of the brain and running the length of the spinal column. The spinal cord contains circuits or nerve cells that control some simple reflexes, such as automatically pulling away from a painfully hot object. The central nervous system communicates with the rest of the body through nerves bundles of fibres that transmit information in and out of the central nervous
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