Transcript Nervous System

Nervous System
Lesson 7 Vocab
neurons – nerve cells, which
make up your nervous system
cerebrum – the largest part of
the brain; where most of your
thinking takes place
cerebellum – the part of the
brain that makes your
muscles work together;
controls most movements
that you do without thinking
hemispheres – two halves of a
sphere, or ball-shaped object,
such as the brain
brain – the major organ in the nervous
system
spinal cord – an organ that carries
messages to and from the brain
nerve – is a bundle of cells that
conducts messages from one part of
the body to another
reflex – an automatic response to
stimuli
Nervous System
1. The nervous system controls all the
systems in your body
2. What do your nerve cells and nerves
do?
–
a. Cells of your nervous system are called
nerve cells, or neurons
i. Neurons have long branches that come out both
ends
ii. They are long and thin
iii. Bundles of neurons
make up nerves
– b. nerves receive and send messages
– c. some carry messages to the brain to
let it know what is happening in and
around your body – sensory nerves
– d. others carry messages from the
brain to muscles, telling muscles what
to do – motor nerves
How Does your Brain Work
– a. The brain is the “control center” of the
body
– b. Always receiving messages and sorts
them out looking for meaning, then tells
the body what to do
c. 3 main parts
i. Cerebrum – largest part, where most
thinking takes place, solves problems,
forms emotions (feelings), makes
decisions, and controls how you learn,
receives and answers messages from
senses
– 1. divided into 2 halves called hemispheres, each
side responsible for different tasks
– 2. 2 halves connected by the corpus callosum
– 3. right side deals with imagination and the arts
– 4. left side deals with words and facts, math
– 5. both are always working together
A concussion is a brain injury which occurs when the head takes a sudden
blow, banging the brain against the side of the skull. Concussions range
from mild (no loss of consciousness) to severe (loss of consciousness).
Patients typically suffer headaches, nausea and dizziness in the short run
and some develop enduring headaches, dizziness and confusion for
months.
Athletes at Central Dauphin have to take an Impact test to give a baseline
for how their brains function prior to a concussion. If they hit their head
playing sports and can’t pass the same test, they have to get treatment
for concussion.
86
10
ii. Cerebellum – the part of the brain that makes
muscles work together, helps move and keep
balance, cerebellum directs most movement
without you thinking about it
iii. Brain stem – lowest part of the brain,
messages moving between brain and the rest of
the body pass through the brain stem
– 1. medulla oblongata takes care of critical life functions
– breathing, heartbeat, swallowing, blood vessels,
controls inner organs
4. What is the job of
your spinal cord?
– a. Starts at the base of
the brain, main path for
messages entering and
leaving the brain
– b. Surround and protects
spinal cord connecting
nerves to brain
– c. Sudden actions that
are done without
thinking are reflexes
Review lesson 7
Review – Lesson 7
1. What does your nervous system
do?
2. How are sensory and motor
nerves different?
3. What are the jobs of the
cerebrum?
4. How are the hemispheres of your
brain able to exchange nerve
messages?