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Chapter 3.3

PSYA01H3 Chapter Notes - Chapter 3.3: Peripheral Nervous System, Human Brain, Thermostat

Course Code
Steve Joordens

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Structure and Organization of the Nervous System
Canadian Heritage Movement makes an important point about the organization of the
Different parts if the brain will be related to different functions, including
sensations, memories and emotions
Focus Questions
How do the different divisions of the nervous system work together when you are
How does the brain control movement?
In this module, we translate our knowledge of nerve cells into an understanding of how
they work as an integrated system
While reading, think about how the different parts of the nervous system apply to your
own behaviour and experiences
Many different parts of your nervous system interact when you perform even the
simplest of behaviours
Divisions of the Nervous System
The nervous system is involved in a number of involuntary processes like controlling your
heart rate, blinking and breathing
Nervous system has a number of divisions that allow these processes to take place
Will examine the difference between the central and peripheral nervous systems
The Central Nervous System
Your ability to think up different answers involves different parts of your central nervous
the central nervous system (CNS): consists of the brain and the spinal cord
The human brain is perhaps the most complex entity known
Its capacity to store information is almost limitless
The other part of CNS, the spinal cord, runs from your neck down to the base of your
Chapter 3.3
Monday, September 30, 2019
9:18 AM

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Spinal cord: receives information from the brain and stimulates nerves that extend
out into the body; this stimulation produces movements
Also receives information from sensory nerves in the body and transmits it
back to the brain
With reflexes, organizes rapid movements without the help of the brain
These two structures are critical for our survival
The Peripheral Nervous System
When you touch something, you are sending information from your central nervous
system to the nervous in the rest of your body that controls movement
You are also receiving sensory input from your body as you interact with your
These processes are performed by the peripheral nervous system (PNS)
Peripheral nervous system (PNS): a division of the nervous system that transmits signals
between the brain and the rest of the body and is divided into two subcomponents, the
somatic system and the autonomic system
Somatic nervous system: consists of nerves that control skeletal muscles, which are
responsible for voluntary and reflexive movement; it also consists of nerves that
receive sensory input from the body
Eg. Walking, moving computer mouse
Autonomic nervous system: the portion of the peripheral nervous system
responsible for regulating the activity of organs and glands
Includes two subcomponents -> one that increases our ability to make rapid
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