...S. McGowen Machine Guns, James H. Willbanks Military Aircraft in the Jet Age, Justin D. Murphy Military Aircraft, 1919–1945, Justin D. Murphy Military Aircraft, Origins to 1918, Justin D. Murphy Pistols, Jeff Kinard Rifles, David Westwood Submarines, Paul E. Fontenoy Tanks, Spencer C. Tucker MEDIEVAL WEAPONS AN ILLUSTRATED HISTORY OF THEIR IMPACT Kelly DeVries Robert D. Smith Santa Barbara, California • Denver, Colorado • Oxford, England Copyright 2007 by ABC-CLIO, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, except for the inclusion of brief quotations in a review, without prior permission in writing from the publishers. Library of Congress Cataloging-in-Publication Data DeVries, Kelly, 1956– Medieval weapons : an illustrated history of their impact / Kelly DeVries and Robert D. Smith. p. cm. — (Weapons and warfare series) Includes bibliographical references and index. ISBN-10: 1-85109-526-8 (hard copy : alk. paper) ISBN-10: 1-85109-531-4 (ebook) ISBN-13: 978-1-85109-526-1 (hard copy : alk. paper) ISBN-13: 978-1-85109-531-5 (ebook) 1. Military weapons—Europe—History—To 1500. 2. Military art and science—Europe—History—Medieval, 500-1500. I. Smith, Robert D. (Robert Douglas), 1954– II. Title. U810.D48 2007 623.4094'0902—dc22 2006102102 11 10 09 08 ...
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...THE NERVOUS SYSTEM The nervous system allows the animal to quickly detect, communicate and co-ordinate information about its external and internal environment so it can make efficient appropriate responses for survival and/or reproduction. The two major parts of our nervous system are the central nervous system (CNS) and peripheral nervous system (PNS). The CNS is made of the brain and spinal cord. The cranial nerves, spinal nerves and ganglia make up the PNS. The cranial nerves connect to the brain. The cranial and spinal nerves contain the axons (fibres) of sensory and motor nerve cells. Nerve cells areas are also known as neurons. Neurons are the basic unit of the nervous system. They carry information or impulses as electrical signals from one place to another in the body. There are 3 types of neurons: Sensory Neurons- Sensory neurons carry electrical signals (impulses) from receptors or sense organs to the CNS. Sensory neurons are also called afferent neurons. The cell body of sensory neurons is outside the CNS in ganglia. Motor Neurons- Motor Neurons Carry Impulses From The CNS To Effector Organs Motor Neurons Are Also Called Efferent Neurons. The Cell Bodies Of Motor Neurons Are Inside The CNS. Interneurons- These are also called intermediate, relay, or associative neurons. They carry information between sensory and motor neurons. They are found in the CNS. TOP The Structure of Neurons A Neuron consists of THREE MAIN PARTS: A. CELL...
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