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Central nervous system - Central nervous system Lets look...

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Central nervous system Lets look first at the central nervous system. Brain. Many invertebrate and vertebrate animals have a nerve cord running from anterior to posterior. Almost invariably this is larger at the anterior end, where sense organs are situated. In vertebrates three sets of paired sense organs, covering smell, sight and hearing/balance are located anteriorly and dorsally. Corresponding to these are three outpushings of the roof of the brain containing groups of nerve cells. The primitive smell brain, sight brain and hearing brain have undergone many changes but are still recognisable in man. The smell brain has become the cerebral hemispheres, the sight brain the tectum (less important in mammals than birds) and the hearing brain the cerebellum. Interestingly in the ventral midline a downpushing produces the infundibular stalk - the link to the endocrine system. Spinal cord The spinal cord is made up of two distinct regions, grey matter and white matter which look like this. The white matter is around the outside and the grey forms an H in the middle. The grey matter is made up of accumulations of the bodies of conducting cells, neurones. These cells have long processes which may pass up and down the cord or out into the peripheral nervous system. Through both white and grey matter run different types of non-conducting glial
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