PSYA01H3 Chapter Notes - Chapter 3: Autonomic Nervous System, Neuroglia, Peripheral Nervous System

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12 Aug 2016
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ORGANIZATION OF THE NERVOUS SYSTEM
Neurons work by forming circuits and pathways in the brain, which in turn influence circuits and
pathways in other areas of the body
Neurons are the building blocks that form nerves, or bundles of axons and the glial cells that
support them
Nervous system – an interacting network of neurons that conveys electrochemical information
throughout the body
Divisions of the nervous system
2 major divisions:
Central nervous system (CNS) – composed of the brain and spinal cord
oReceives sensory information from the external world, processes and coordinates this
information and sends commands to the skeletal and muscular systems for action
oAt the top of the CNS rests the brain, which contains structures that support the most
complex perceptual, motor, emotional, and cognitive functions of the nervous system
oThe spinal cord branches down from the brain; nerves that process sensory information
and relay commands to the body connect to the spinal cord
Peripheral nervous system (PNS) connects the central nervous system to the body’s organ
and muscles
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