1. The Brain – Lesson 8.3
Three Major Parts of the Brain
1. Cerebrum
2. Cerebellum
3. Brain stem

2. Brain
stem

3. 1. Cerebrum
oDivided into two hemispheres
oRight – creative, big picture
oLeft – logical, mathematical
oRight side of brain controls the
left side of the body
oLeft side of the brain controls
the right side of the body

4. Longitudinal fissure
divides two halves of
cerebrum

5. oTwo sides connected by the
corpus callosum a nerve bundle

7. oCerebrum consist of both gray
matter and white matter
oGray matter on the outside
called cerebral cortex
o and white matter on the inside
oPage 171 in text

8. Note: Brain is convoluted or
folded to get more in a tight
space.
So well designed equivalent all
phone cable of world into a
thimble – WOW!

10. Four division or pairs of lobes of
the cerebrum
Frontal lobes (right and left)
Parietal lobes (right and left)
Occipital lobes (right and left)
Temporal lobe (right and left)

12. Frontal lobe:
location of personality, judgment
and self control
Motor area of frontal lobe – part
of frontal lobe in the rear portion
controls the voluntary movement
of the skeletal muscles.

14. Parietal lobes: analyzes the senses
Specific areas in lobe for specific
areas of the body.

15. Occipital lobe: sense of vision
Temporal lobes: sense of
hearing, smell and taste

16. Three Major Parts of the Brain
1. Cerebrum
2. Cerebellum
second largest brain region
right and left hemispheres
white and gray matter
tightly packed, convoluted

18. 2. Cerebellum
Function:
To take over the skeletal muscle
control from the cerebrum so it
is free to think about biology!
Cerebrum slowly gives up as
practice (ex. Basketball layup)

19. Three Major Parts of the Brain
1. Cerebrum
2. Cerebellum
3. Brain stem
located between
cerebrum and spinal cord

21. 3 parts to brain stem:
a. medulla oblongata
• lowest section of brain stem
•regulates breathing, blood
pressure, and other vital functions
•crossover occurs in medulla
oblongate

24. 3 parts to brain stem:
a. medulla oblongata
b. Pons
 links cerebrum and
cerebellum
 assist medulla in regulating
breathing
 coordinates eye movement

26. 3 parts to brain stem:
a. medulla oblongata
b. Pons
c. Midbrain
located above the pons
coordinates eye movements
and pupil dilation
contains reticular formation

28. Reticular Formation:
On/off switch of cerebrum
Switches cerebral cortex on you
wake and are conscious/off you go
to sleep, adjust level of alertness
Damage = coma

29. Reticular formation nuclei are located
throughout the brain stem.

30. Limbic System
a number of complex
brain structures
around the brain stem.

31. Limbic system includes:
thalamus – switch board –
sends pulses to right place in
brain
hypothalamus – control unit
for autonomic and endocrine
systems (adrenaline)