Download Nervous System & Senses

The Nervous System
Alligator’s medulla oblongata
Central Nervous System
Two Parts:
• Brain
• Spinal Cord
The Brain
Cerebrum
Planning
Sensations
Spatial Judgements
Reasoning
Emotion
Social Skills
Vision
Understanding
Learning
Memory
Cerebellum
Organizing Info
Balance and
muscle
coordination
Brain Stem
Involuntary
actions
The Spinal Cord
• Controls reflexes
Peripheral Nervous System
• All nerves
outside of brain
and spinal cord
• 31 pairs of nerves branch
off the spinal cord
Neurons
• Basic unit (cell) of the Nervous System
• Carry messages in the form of electrical
impulses
Synapse
• Synapse: The space between the
neurons where the electrical
impulse (message) is passed
Messages
jump
across
Drugs
and
the synapse
alcohol
disrupts
like the
an
electrical
communication
current
between
neurons
* An automatic reaction that
happens without thinking about it.
* A reflex happens quickly in
less than a second.
When a reflex impulse occurs, the
reaction happens very quickly.
This is because the impulse does
not go all the way to the brain.
It travels from the site where the
stimulus occurs,
To the spinal cord,
And then back to the site of stimulus, so
a reaction can take place.
When a voluntary impulse occurs, you
have conscious control over your
movement.
This involves the brain.
It travels from the site,
To the spinal cord,
To the brain,
Back to the spinal cord,
Then to the muscle you want to move.
You have a nerve along your whole arm.
The “funny bone” is the only place on
the arm where the nerve is not
protected.
The “funny bone” is on the elbow.
“Fight or Flight”
In extreme situations
people have been known
to take on super-human
abilities.
This is the work of your
Nervous and Endocrine
system
(glands and hormones)
working together.
You have adrenal glands
on top of your kidneysthat release adrenaline
when the brain tells it to
do so.