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Neuroscience NEUROSCIENCE SCIENCE OF THE BRAIN AN INTRODUCTION FOR YOUNG STUDENTS British Neuroscience Association European Dana Alliance for the Brain This booklet was prepared and edited on behalf of the British Neuroscience Association and the European Dana Alliance for the Brain by Richard Morris (University of Edinburgh) and Marianne Fillenz (University of Oxford). The graphic design was by Jane Grainger (Grainger Dunsmore Design Studio, Edinburgh). We are grateful for contributions from our colleagues in the Division of Neuroscience, particularly Victoria Gill, and others in the neuroscience community in Edinburgh. We also thank members of the University Department of Physiology in Oxford, particularly Colin Blakemore, and helpful colleagues in other institutions. Their names are listed on the back page. The British Neuroscience Association (BNA) is the professional body in the United Kingdom that represents neuroscientists and is dedicated towards a better understanding of the nervous system in health and disease. Its members range from established scientists holding positions in Universities and Research Institutes through to postgraduate students. The BNA’s annual meetings, generally held in the spring, provide a forum for the presentation of the latest research. Numerous local groups around the country hold frequent seminars and these groups often organise activities with the general public such as school visits and exhibitions in local museums. See http://www.bna.org.uk/ for further information. The goal of The European Dana Alliance for the Brain (EDAB) is to inform the general public and decision makers about the importance of brain research. EDAB aims to advance knowledge about the personal and public benefits of neuroscience and to disseminate information on the brain, in health and disease, in an accessible and relevant way. Neurological and psychiatric disorders affect millions of people of all ages and make a severe impact on the national economy. To help overcome these problems, in 1997, 70 leading European neuroscientists signed a Declaration of Achievable Research Goals and made a commitment to increase awareness of brain disorders and of the importance of neuroscience. Since then, many others have been elected, representing 24 European countries. EDAB has more than 125 members. See http://www.edab.net/ for further information. Published by The British Neuroscience Association The Sherrington Buildings Ashton Street Liverpool L69 3GE UK Copyright British Neuroscience Association 2003 This book is in copyright. Subject to statutory exception and the provisions of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of The British Neuroscience Association First Published 2003 ISBN: 0-9545204--0-8 The images on this page are of neurons of the cerebral cortex visualised using special dyes inserted into the adjacent cells. Neuroscience: the Science of the Brain 1 The Nervous System P2 2 Neurons and the Action Potential P4 3 Chemical Messengers P7 4 Drugs and the Brain P9 5 Touch and Pain P11 6 Vision P14 Inside our heads, weighing about 1.5 kg, is an astonishing living organ consisting of 7 Movement P19 billions of tiny cells. It enables us to sense the world around us, to think and to talk. The human brain is the most complex organ of the body, and arguably the most 8 The Developing P22 complex thing on earth. This booklet is an introduction for young students. Nervous System In this booklet, we describe what we know about how the brain works and how much 9 Dyslexia P25 there still is to learn. Its study involves scientists and medical doctors from many disciplines, ranging from molecular biology through to experimental psychology, as well as the disciplines of anatomy, physiology and pharmacology. Their shared 10 Plasticity P27 interest has led to a new discipline called neuroscience - the science of the brain. 11 Learning and Memory P30 The brain described in our booklet can do a lot but not everything. It has nerve cells - its building blocks - and these are connected together in networks. These 12 Stress P35 networks are in a constant state of electrical and chemical activity. The brain we describe can see and feel. It can sense pain and its chemical tricks help control the uncomfortable effects of pain. It has several areas devoted to co-ordinating our 13 The Immune System P37 movements to carry out sophisticated actions. A brain that can do these and many other things doesn’t come fully formed: it develops gradually and we describe some 14 Sleep P39 of the key genes involved. When one or more of these genes goes wrong, various conditions develop, such as dyslexia. There are similarities between how the brain 15 Brain Imaging P41 develops and the mechanisms responsible for altering the connections between nerve cells later on - a process called neuronal plasticity. Plasticity is thought to underlie learning and remembering. Our booklet’s brain can remember telephone 16 Artificial Brains and P44 numbers and what you did last Christmas. Regrettably, particularly for a brain Neural Networks that remembers family holidays, it doesn’t eat or drink. So it’s all a bit limited. But it does get stressed, as we all do, and we touch on some of the hormonal and 17 When things go wrong P47 molecular mechanisms that can lead to extreme anxiety - such as many of us feel in the run-up to examinations. That’s a time when sleep is important, so we let it have 18 Neuroethics P52 the rest it needs. Sadly, it can also become diseased and injured. New techniques, such as special electrodes that can touch the surface of cells, 19 Training and Careers P54 optical imaging, human brain scanning machines, and silicon chips containing artificial brain circuits are all changing the face of modern neuroscience. 20 Further Reading and P56 We introduce these to you and touch on some of the ethical issues and social Acknowledgements implications emerging from brain research. The Neuroscience Community at the University of Edinburgh The European Dana Alliance for the Brain To order additional copies: Online ordering: www.bna.org.uk/publications Postal: The British Neuroscience Association, c/o: The Sherrington Buildings, Ashton Street, Liverpool L68 3GE Telephone: 44 (0) 151 794 4943/5449 Fax: 44 (0) 794 5516/5517 The Nervous System Neurons have an architecture that consists of a cell body and two sets of additional compartments called ‘processes’. One of these sets are called axons; their job is to transmit information from the neuron on to others to which it is connected. The other set are called dendrites - their job is to receive the information being transmitted by the axons of other neurons. Both of these processes participate in the specialised contacts called synapses (see the Chapters 2&3 on Action Potential and Chemical Messengers). Neurons are organised into complex chains and networks that are the pathways through which information in the nervous system is transmitted. The brain and spinal cord are connected to sensory receptors and muscles through long axons that make up the peripheral nerves. The spinal cord has two functions: it is the seat of simple reflexes such as the knee jerk and the rapid withdrawal of a limb from a hot object or a pinprick, as well as more complex reflexes, and it forms a highway between the body and the brain for information Human central nervous system showing the brain and travelling in both directions. spinal cord These basic structures of the nervous system are the same Basic structure in all vertebrates. What distinguishes the human brain is its large size in relation to body size. This is due to an enormous The nervous system consists of the brain, spinal cord and increase in the number of interneurons over the course of peripheral nerves. It is made up of nerve cells, called evolution, providing humans with an immeasurably wide choice neurons, and supporting cells called glial cells. of reactions to the environment. There are three main kinds of neurons. Sensory neurons are coupled to receptors specialised to detect and Anatomy of the Brain respond to different attributes of the internal and external environment. The receptors sensitive to changes in light, The brain consists of the brain stem and the cerebral sound, mechanical and chemical stimuli subserve the sensory hemispheres. modalities of vision, hearing, touch, smell and taste. When mechanical, thermal or chemical stimuli to the skin The brain stem is divided into hind-brain, mid-brain and a exceed a certain intensity, they can cause tissue damage ‘between-brain’ called the diencephalon. The hind-brain is an and a special set of receptors called nociceptors are extension of the spinal cord. It contains networks of activated; these give rise both to protective reflexes and to neurons that constitute centres for the control of vital the sensation of pain (see chapter 5 on Touch and Pain). functions such as breathing and blood pressure. Within Motor neurons, which control the activity of muscles, are these are networks of neurons whose activity controls these responsible for all forms of behaviour including speech. functions. Arising from the roof of the hind-brain is the Interposed between sensory and motor neurons are cerebellum, which plays an absolutely central role in the Interneurones. These are by far the most numerous (in the control and timing of movements (See Chapters on human brain). Interneurons mediate simple reflexes as well Movement and Dyslexia). as being responsible for the highest functions of the brain. Glial cells, long thought to have a purely The midbrain contains groups of neurons, each of which seem supporting function to the neurons, are now known to make to use predominantly a particular type of chemical an important contribution to the development of the messenger, but all of which project up to cerebral nervous system and to its function in the adult brain.
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