Transcript 3 Types of nervous systems

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
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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
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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
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