Transcript The Amazing Brain!

The Amazing Brain!
Brain Plasticity
• If a part of the brain is damaged
sometimes a different part of the brain
can take over those functions.
How do we know about brain
anatomy and functions?
1. Accidents
2. Lesions
3. MRI (Magnetic Resonance
Imaging)
Brain Composition
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78% water
10-12% lipids(a key part of living cells)
8% protein
1% carbs
2% soluble organics
1% inorganic salt
Brain Vitals
• 3 lbs.
• 100 billion neurons (same as the # of stars in
the galaxy)
• 750-1000 ml of blood flow through it every
minute (3 soda cans)
• The brain can stay alive 4-6 minutes without
oxygen
• It is 2% of body weight but uses 20% of the
body’s energy
Cerebellum
• The cerebellum contains half of all of
the brain’s neurons, but comprises only
10% of the brain
Cerebrum
• The cerebrum is about 85% of the brain.
The cerebral cortex is the outer edge of
the cerebrum.
Evolution of the Brain
• Hindbrain-The oldest part of the brain.
The human hindbrain is structurally very
similar to the hindbrains of other
vertebrates.
• It includes structures that carry out
functions most essential for survival:
sleeping/waking, breathing, blood flow
Midbrain
The Midbrain
• The midbrain is located above the
hindbrain. All sensory and motor
information passing back and forth
between the forebrain and spinal cord
must go through the midbrain.
• It contains important centers for
regulating body movement in response
to visual or auditory stimulation.
The Forebrain
The Forebrain
• Most prominent part of the mammalian
brain.
• The greatest difference between human
brains and those of other primates is the
size of the forebrain. Humans have
considerably larger forebrains
The Frontal Lobe
• The advanced development of the
frontal lobe enables humans to:
-have goal-directed behavior
-concentrate
-control emotions and temperament
*It is also involved in many aspects of
personality.