1. The Midbrain approximately 2 cm long
forms a major part of the brainstem
Is the most complex portion of the brain stem

2. The Midbrain
The midbrain helps coordinate sensory information with simple movements. 
What does that mean?  Sensory information is anything you feel using one of your five basic senses.  If someone hocks a lugi  at your head and you watch the goober travel through the air and track the incoming with your eyes at it races at your head, you are using your vision and eye and neck muscles together.  That is what I mean by sensory information with simple movements.  Just reading this text now, you are using your midbrain to keep your eyes and head moving.

3. The Midbrain
The key part of the midbrain for psychological purposes is the Reticular Formation
It controls arousal. 
Not sexual arousal, but actual "wake me up" arousal".  If you were in a deep sleep and I stimulated your Reticular Formation you would instantly wake up and not be tired at all.  If I lesioned (cut out) your Reticular Formation, you would fall into a coma in which you would never wake.

4. Damage to the Midbrain If a boxer is knocked out,
part of the reason lies in
the mid-brain. If a person
is unconscious due to a
damaged midbrain, he
might go into a coma
because the forebrain
can not be aroused

5. The Hindbrain
The area of the brain comprising the pons, medulla and cerebellum The hindbrain functions collectively to co-ordinate various functions

6. The Pons The word “pons” means bridge .
It functions as a bridge to interconnect messages between the spinal cord and brain
If someone has a serious
sleep disorder, it may involve the pons as the pons makes the chemicals involved in sleep
Also important in controlling breathing .
In Latin, pons makes the chemicals
involved in sleep
(Purves et al., 2004).
The brain stem is located beneath the limbic system. It is responsible for vital life functions such as breathing, heartbeat, and blood pressure. The brain stem is made of the midbrain, pons, and medulla.

7. The Medulla Injury to the medulla results in instant death .
The medulla, which is located
at the top of the spinal cord,
includes a group of cells that
control vital reflexes, such as
respiration, heart rate, and
blood pressure.
control our heart rate, blood pressure and breathing. 
located directing above our spinal cord
if you get hurt in the Medulla you should just pack it in.
Injury to the medulla results in instant death .

8. The Medulla . The medulla, which is located
at the top of the spinal cord,
includes a group of cells that
control vital reflexes, such as
respiration, heart rate, and
blood pressure.
If someone dies of a drug overdose, the cause of death probably involved the medulla
Large amounts of alcohol,
heroin, or other depressant drugs suppress the functions of cells in the medulla and cause death by
stopping breathing.
he primary role of the pons is to serve as a bridge between various parts of the nervous system, including the cerebellum and cerebrum. As part of the brainstem, a section of the lower pons stimulates and controls the intensity of breathing, while a section of the upper pons decreases the depth and frequency of breaths. The pons is also associated with the control of sleep cycles, and controls respiration and reflexes.

9. Cerebellum Found at the at the back of your head under the cerebrum
Means “little brain”
The Cerebellum helps us coordinate our balance and fine muscle movements. 
Often takes over learned activities- like riding a bike
Of the brain’s three parts, the forebrain is the
largest, most evolved, and most responsible for
an enormous range of personal, social, emotional,
and cognitive behaviors. For those reasons,
we’ll examine the forebrain in more detail.

10. Cerebellum
A person suspected of drunken driving may fail the test of rapidly touching a finger to the nose because of alcohol’s effects on the cerebellum. Because alcohol is a depressant drug and interferes with the functions of the cerebellum, an intoxicated person would experience decreased coordination and have difficulty rapidly touching a finger to the nose, which is one of the tests for being drunk.
Of the brain’s three parts, the forebrain is the
largest, most evolved, and most responsible for
an enormous range of personal, social, emotional,
and cognitive behaviors. For those reasons,
we’ll examine the forebrain in more detail.

11. Copyright: Gary Larson