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Chapter 4

Chapter 4.docx

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Chapter 4Biology of Behaviour Brain and components10100 billion nerve cells in our brain along with helper cellsFlourens emphasized different parts are responsible for different functionsDonald Hebb considered nerve cells are organized into larger units modules which are connected to otherStructure of the nervous systemBrain has three major functions 1 controlling behaviour 2processing and retaining information we receive from the environment 3 regulating the bodys physiological needsCentral Nervous system brain and spinal cordSpinal cord long thing collection of nerve cells attached to base of brain and running down spinal columnNerves bundles of fibres that transmit information in and out of the central nervous system from organsPeripheral nervous system the cranial and spinal nerves that are attached to the brain and spinal cordCranial nerves bundle of nerve fibres attached to the base of the brain from face and headSpinal nerve bundle of nerve fibres attached to spinal cord and carries messages to muscles and glands Three major parts1 brainstem includes medulla pons midbrain 2 cerebral hemispheres largest part of brain covered by cerebral cortex3 cerebellum attached to the back of the brain stem controls and coordinates movementsVertebraecolumn of hollow bones encase the spinal cord and constitute the vertebral columnMeninges the tgree layered set of membranes that enclose the brain and spinal cordThe brain floats in a clear liquid called cerebrospinal fluidBloodbrain barrier barrier between blood and brain produced by cells in brains capillaries prevents toxicCerebral cortex outer layer of the cerebral hemispheres of the brain 3mm thick Grey matter portions of CNS that are abundant in cell bodies of neurons rather than axons White matter portion abundant in axons colour derives from myelin sheaths on axonsFissure large grooves and gyrus the little bumps Celles of nervous systemNeuronsnerve cells bring sensory information to the brain store memories control activity of the musclesGlia a cell of the central nervous system that provides support for neurons and supplies them with some essential chemicalsThey work as immune system help neuron stay in placeDendrites tree like growths attached to body of nerve cell teceive message from other neurons
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