Download Nervous System Organization

November 18-19, 2013
Nervous System Fun Facts
Which “fact” is false?
1) All body functions are controlled and regulated by the
nervous system
2) There are more neurons in the brain then there are stars
in the Milky Way galaxy
3) The left side of the body is controlled by the right side of
the brain and vice-versa
4) The brain reaches maturity at around 25 years of age.
The endocrine system also controls and regulates some body
functions, especially metabolism, growth, and reproduction.
Nervous System Functions
The nervous
system has three
major functions:
1) Sensory input
2) Integration
3) Motor output
Nervous System Functions
1) Sensory input –
the body gathers
information, or
stimuli, from the
internal or
external
environment
Ex) seeing a bright
light
Nervous System Functions
2) Integration– the
body processes
information and
makes a decision
about what should
be done
Example:
“decision” to
initiate flight – orfight response
Nervous System Functions
3) Motor Output–
the body activates
muscles or glands
to effect a
response.
Example: moving
your arm to grab a
chip
Nervous System Functions
Which function(s) are demonstrated in these examples?
 You hear a buzzing sound.
Sensory input
 You weigh the pros and cons of two different
universities, and make a choice. integration
 You move your leg
Motor output
 You touch a hot stove and jerk your hand back.
Sensory input,
integration,
motor output
Nervous System Organization
The nervous system can be organized by structure and by
function.
Nervous System Organization
Structurally, the nervous system is organized into
 The central nervous system,
which consists of the brain and spinal
cord, and which acts to integrate
(interpret & issue instructions for)
stimuli
 The peripheral nervous system which
consists of all the nerves outside the
brain and spinal cord. These receive
stimuli and effect responses in muscles
and glands.
Nervous System Organization
Nervous System Organization
The peripheral nervous system can be further divided into:
1) Afferent or sensory neurons
- bring stimuli
-- affect the body by internal or external information
2) Efferent or motor neurons
-- cause muscles or glands to
respond
-- effect a change / response
Mneumonic: A comes before E
Nervous System Organization
The efferent / motor neurons can be further divided into:
1) Somatic neurons
- neurons that control
skeletal muscles
- mostly voluntary
2) Autonomic neurons
-- neurons that control
smooth and cardiac
muscle and glands
- involuntary
Nervous System Organization
Determine which parts of the nervous system are involved in
these:
You hear a buzzing sound.
You weigh the pros and
cons of two different
universities, and make a
choice.
You move your leg
You touch a hot stove and
jerk your hand back.
Nervous System Organization
Determine which parts of the nervous system are involved in
these:
You hear a buzzing sound.
You weigh the pros and
cons of two different
universities, and make a
choice.
You move your leg
You touch a hot stove and
jerk your hand back.
Afferent (peripheral)
Central nervous system
Central nervous system
1) Afferent (peripheral)
2) Central nervous system
3) somatic (efferent, peripheral)
Exit Ticket – Complete two vocab mini posters
Closure
 What were our objectives today and what are your
biggest take-aways?
 How does what we did today relate to our unit
objective?
 How does what we did today related to LP or TOK?
Homework
 Complete neuroglia reading and worksheet, if not yet
done
 Read chapter 7