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UNIT 3 The interaction function TYPES OF NERVOUS SYSTEMS Natural Science 2. Secondary Education UNIT 3 Types of nervous systems NERVOUS SYSTEMS NETWORK OF NEURONS CENTRAL NERVOUS SYSTEM Click on each box to find out more Natural Science 2. Secondary Education UNIT 3 Types of nervous systems Network of neurons • Found in cnidarians (polyps and jellyfish). • They do not have a central nervous system. They just have a network of interconnected neurons running along the walls of their bodies. Network of neurons A network of neurons in a polyp Natural Science 2. Secondary Education Go back to the Start menu UNIT 3 Types of nervous systems Central nervous system • Found in most animals: • In a central nervous system, neurons are grouped together to form: • Nerve centres, which are normally found in the head. They process information: • Ganglia: in molluscs and arthropods • Brain and spinal cord: in vertebrates • Nerves, which connect the sense organs to the nerve centres and these centres to the effectors. Spinal cord Ganglia Brain Nerves Natural Science 2. Secondary Education The nervous systems of a mollusc and a mammal Go back to the Start menu