Transcript The Nervous System

The Nervous System
LOGAN BASNER
GARRETT PACE
CHASE TALBOT
What is the Nervous System?
 The nervous system
essentially encompasses
everything that enables
us to feel and allows one
part of our body to
communicate with the
other.
 The human nervous
system is comprised of
two basic parts, the
central and the
peripheral.
Central Nervous System
 The central system consists
of the brain, spinal cord,
and the retina of your eye.
 The brain is composed of
Neurons, also known as a
brain cell.
 The brain has about 100
billion brain cells.
 The spinal cord is crucial
for everyday function as it
transmits commands from
the brain to the rest of the
body.
 The human brain weighs
about 3 pounds.
 The central nervous system
processes and sends out
commands to the rest of
the body.
Brain
 Divided into three parts:
The brain stem (an
extension of the spinal
cord), the forebrain
(Primarily consists of the
Cerebrium), and the
Cerebellum.
 Forebrain and Cerebellum
are divided into two
hemispheres, which are
linked by a thick band of
nerve fibers and these
hemispheres have areas,
called "lobes," which
perform specific functions.
 The brain contains gray
nerve cells, which surround
a smaller mass of white
nerve fibers.
Peripheral Nervous System
 Peripheral Nervous System is a term used to describe
the nervous system that does not include the
vertebrae, brain, and retina.
 The peripheral nervous system is essentially the
“wiring” of the body.
Spinal Cord
 The thickest nerve in the
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human body is 1 inch thick.
The thinnest nerve in the
human body is thinner than a
human hair.
Each nerve is a bundle of
hundreds or thousands of
neurons (
The spinal cord runs down a
tunnel of holes in your
backbone or spine. The bones
protect it from damage. The
cord is a thick bundle of
nerves, connecting your brain
to the rest of your body
nerve cells).
I bet you didn’t know that…
 The human brain uses
 About 12 percent of people
about 20% of the body’s
oxygen.
 The human brain weighs
about 3 pounds.
 Albert Einstein’s brain was
similar to the average
human brain except for the
region associated with
math and spatial percept,
where his brain was 35%
larger than the average.
dream in black and white,
while the remaining 88%
dream in color.
 The human brain stops
growing around the age of
18.
 The brain is around 60%
fat.
 The human brain contains
about 100,000 miles of
blood vessels.
Neurons
 Neurons are electrically excited
cells that communicate through
the spinal cord to the brain and
vise versa.
 Neurons also use synapses to
direct electrical impulses.
 There are two types of synapses,
chemical and electrical.
 They are part of the peripheral
nervous system.
 During some points of
pregnancy, 250,000 neurons are
created every minute.
 There are three types of neurons:
sensory respond to touch, sound,
light and numerous other stimuli
affecting cells of the sensory
organs that then send signals to
the spinal cord and brain. Motor
Neurons receive signals from the
brain and spinal cord and cause
muscle contractions and affect
glands.
 Interneuron connect neurons to
other neurons within the same
region of the brain or spinal cord.