The nervous system is one of the most complex systems in the human body, and if we try to simplify it, we can say that it consists of two main and main parts: * The central nervous system * peripheral nervous system We will limit the definition here to the components of the central nervous system only, which consists of the main parts: 1- Brain (cerebrum, cerebellum, medulla oblongata or brainstem) 2- The spinal cord, the spinal cord, or the medulla 3- neurons or neurons

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What is the human nervous system made of?
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What is the nervous system made of?
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The nervous system is one of the most complex systems
in the human body, and if we try to simplify it, we can say
that it consists of two main and main parts:
The central nervous system
peripheral nervous system
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2. We will limit the definition here to the components of the
central nervous system only, which consists of the main
parts:
1
- Brain (cerebrum, cerebellum, medulla oblongata or
brainstem)
2
- The spinal cord, the spinal cord, or the medulla
3
- neurons or neurons
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First, the brain (the cerebrum, cerebellum, medulla
oblongata or brainstem:)
It is the center of the central nervous system, from which
all orders and instructions go to the rest of the body. It
consists of the cerebrum, cerebellum, medulla oblongata,
or brain stem.
 The brain is two separate hemispheres and is
responsible for sensory and perceptual tasks
 The cerebellum is also in the brain and below the
cerebrum, which is responsible for the balance of the
body
 The medulla oblongata, or brainstem, is between
the brain and the spinal cord and regulates
involuntary functions
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3. Second, the spinal cord:
It is the spinal cord or the spinal cord or the medulla, and it
is a main cable through which the main nerve bundles
pass from the brain and to the branch bundles and from
there to all parts of the body.
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Third, neurons
It is a network of neurons extending between the main
bundles and sub- bundles and transmitting all signals and
connected to each other by ganglia and endings.
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Another important component of the nervous system is the
autonomic nervous system
It consists of the sympathetic nervous system and the
parasympathetic nervous system to regulate the functions
of the rest of the body, such as the eyes, the secretion of
saliva, the heart, the lungs, the liver and the bladder
through the vagus nerve and the sympathetic ganglia
chain
Where the effect on the body parts is as follows :
-
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4.  Eye: Causes pupils to dilate
 trachea It also fits
‫الكظر‬ ‫لب‬ : hormone secretion adrenaline ‫والنورأدرينالين‬
 the college: hormone secretion chime
 Ural and bladder: catch and stretch
 Male reproductive system: stimulates ejaculation
 the heart: systole and diastole of the heart
 blood vessels: constriction
 Digestive system: decrease in muscle movement.
In the end, we can only say, Glory be to God, the
wonderful Creator
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