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Title: Brain Stem
Description: These notes are written for a first year high school Anatomy and Physiology student. They are rather simply worded and easy to understand. They go into detail about the parts of the brain stem, what each part regulates, and their basic functions.

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Faith Deskins 
Anatomy and Physiology 
12/08/2015 
 
Chapter 9 Part 2 Notes 
 
1
...
Diencephalon ­ Located between cerebral hemispheres and above the 
midbrain, and contains four main parts 
 
1
...
Hypothalamus ­ Maintains homeostasis by serving as a link 
between nervous and endocrine system and by regulating the 
following activities: 
a
...
Body temperature 
c
...
Body weight and controls hunger 
e
...
Productions of neurosecretory substances that stimulate 
the pituitary gland to release various hormones 
g
...
Limbic System ­ Involved in emotional experience and expression 
 
­ Modifies the way a person acts by producing such feelings 
as fear, anger, pleasure, and sorrow 
­ Guides behavior to increase survival 
 
4
...
Midbrain ­ Located between the diencephalon and pons 

1
...
Contains nerve fibers that serve as motor pathway for between 
cerebrum and lower parts of nervous system 
 
C
...
Dorsal portion consists of longitudinal nerve fibers that relay 
impulses to and from medulla oblongata and cerebrum  
2
...
Medulla Oblongata ­ Enlarged continuation of spinal cord extending from 
the pons to foramen magnum  
1
...
Nuclei within MO function as control centers for the following 
activities 
a
...
Vasomotor Center ­ Controls constriction and dilation of 
blood vessels which in turn controls blood pressure 
c
...
Other nuclei within MO function as center for reflexes 
associated with coughing, sneezing, swallowing, and 
vomiting  
E
...
Signals the cerebral cortex with sensory impulses activating it into 
a state of wakefulness  
2
...
Sleep results from decreased activity in reticular formation  
4
...
Cerebellum ­ A large mass of tissue located below the occipital lobes of the cerebrum 
and behind the medulla oblongata and pons 
 
Two Hemispheres 
 
1
...

3
...


Connected by veins 
Separated by layer of dura mater 
Covered by thin layer of gray matter called cerebellar cortex 
Consists of three pairs of nerve tracts called cerebellar peduncles 

a
...
Middle Peduncles ­ Transmits signals from the cerebral cortex to 
the cerebellum concerning desired position of the above parts 
c
...
Cerebrocerebellum ­ Receives signals from cerebrum 
2
...
Spinocerebellum ­ Receives electrical signals from the spinal cord 
 
­
­
­
 

Surface of cerebellum is shaped by thin folds called folia 
It coordinates motor activity, posture, and balance, and helps us store information 
about motor skills 
Damage to the cerebellum may cause tremors, inaccurate movements of 
voluntary muscle, loss of muscle tone, a distorted walk, and/or loss of equilibrium  


Title: Brain Stem
Description: These notes are written for a first year high school Anatomy and Physiology student. They are rather simply worded and easy to understand. They go into detail about the parts of the brain stem, what each part regulates, and their basic functions.