to the brain
tissue can result in many serious
physical and cognitive deficits. How a person
recovers from a stroke depends on the area of the brain that is involved and the extent
of damage done.
The brain is
divided into three areas, the Cerebrum, Cerebellum and Brain Stem.
Note: The cerebrum
is is divided into two halves or
Left Hemispere - The
left side of the brain controls the
right side of the body. Stroke to the left side of the brain can weaken
or paralyze the right side of the body, and may cause problems with
speech and with the understanding of spoken and written language.
Right Hemispere - The
right side of the
brain controls the left side of the body. Stroke to the
right side of
the brain can weaken or paralyze the left side of the body and may
cause lack of awareness and neglect of the left side of the body.
to the American Stroke Association (ASA), 87% of strokes are classified
strokes occur when the arteries
to your brain become narrowed or blocked, causing severely reduced
blood flow (ischemia). Ischemic
strokes can be further divided into the following two categories:
- Thrombotic - A thrombotic
stroke occurs when a blood clot (thrombus) forms in one of the arteries
that supply blood to your brain. A clot may be caused by fatty deposits
(plaque) that build up in arteries and cause reduced blood flow
(atherosclerosis) or other artery conditions.
- Embolic - An embolic stroke
occurs when a blood clot or other debris forms away from your brain — commonly in your heart
— and is swept through your bloodstream to lodge in narrower brain
arteries. This type of blood clot is called an embolus.
National Institute of Health (NIH), intracerebral hemorrhage is the
second most common subtype of stroke after ischemic stroke and accounts
for approximately 10 - 20 % of all strokes.
strokes occur when a blood vessel that supplies the brain ruptures and
bleeds. When an artery bleeds into the brain, brain cells and tissues
do not receive oxygen and nutrients. In addition, pressure builds up in
surrounding tissues and irritation and swelling occur, which can lead
to further brain damage. Hemorrhagic
strokes are further divided
into the following two categories:
(high blood pressure), and bleeding occurs suddenly and rapidly. There
are usually no warning signs and bleeding can be severe enough to cause
coma or death.
- Caused when
between the brain and the meninges (the membrane that covers the brain)
in the subarachnoid space. This type of hemorrhage is often due to an aneurysm
The cerebellum is the area of the brain
that regulates all movements and maintains balance. It coordinates
movements and speech muscles. Damage to the cerebellum can cause lack
of balance or coordination on the same side of the body. It can also
cause slurring of speech.
Brain stem strokes are very rare. The brain stem is a very
delicate area attached to the spinal cord by
thick nerve fibers. It controls life-sustaining functions such as
breathing, blood pressure, and heart rate. A brain stem stroke that
happens to this part of the brain can cause serious impairment in its
life-sustaining functions. Symptoms of dizziness, slurred speech and
double vision are also common. It may also cause paralysis on both
sides of the body.