Download Nervous System

NERVOUS SYSTEM
CENTRAL AND PERIPHERAL
CENTRAL NERVOUS SYSTEM
• Consists of your brain and spinal
cord.
 THE BRAIN IS THE MAIN CONTROL CENTER OF THE
NERVOUS SYSTEM.
 THE BRAIN HAS 3 MAIN PARTS: CEREBRUM,
CEREBELLUM AND THE MEDULLA. EACH HAS ITS
OWN JOB.
3 MAIN PARTS OF THE BRAIN
CEREBRUM: LARGEST PART OF THE BRAIN. IT CONTAINS 2 HALVES,
RIGHT HEMISPHERE DIRECTS THE LEFT SIDE OF BODY AND LEFT
HEMISPHERE CONTROLS THE RIGHT SIDE OF THE BODY.
CEREBELLUM: SECOND LARGEST PART OF THE BRAIN. THIS
PROCESSES SENSORY INFORMATION FROM YOUR BODY AND IS
LOCATED BELOW THE CEREBRUM.
MEDULLA: CONNECTS BRAIN TO SPINAL CORD. THIS CONTROLS
INVOLUNTARY PROCESSES SUCH AS BLOOD PRESSURE, BODY
TEMPERATURE, HEART RATE AND BREATHING.
3 Main Parts of the Brain
LOBES OF THE BRAIN
FRONTAL LOBE: In charge of speech, movement, emotions, problem
solving, memory
OCCIPITAL LOBE: In charge of vision
PARIETAL LOBE: In charge of touch, temperature and pain
TEMPORAL LOBE: In charge of hearing
THE SPINAL CORD
The nerve fibers in your spinal cord allow
the brain to communicate with your
peripheral nervous system.
PERIPHERAL NERVOUS SYSTEM
Messages about your environment travel through the nervous
system called neurons.
A neuron is a nerve cell that is specialized to transfer messages
in the form of fast-moving electrical energy. These electrical
messages are called impulses.
A neuron has a large region in the center called the cell body.
Dendrites are usually short, branched extensions of the cell.
Axons are elongated extensions of the neuron. The tip of each
axon is called the axon terminal.
NEURONS
A new born
babies brain
grows 3 times in
the 1st year
If we lined up all
of the brains
neurons it
would stretch
600 miles
Average Human
Brain weighs 3
lbs.
Fun
Facts
As we get older
the brain loses 1
gram per year in
weight
The folds of the
brain are called
Gyri
There are 100
billion neurons
in your brain