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Natural Science 2. Secondary Education
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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 ofneurons
A network of neurons in a polyp
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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
The nervous systems of a mollusc and a mammal
Nerves
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