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What is the nervous system?

Your nervous system helps the different parts of your body to communicate with each other. Signals in your nervous system are sent along a complex network of nerve cells called neurons.

While you only have one nervous system, it’s divided into two different parts. These are your:

  • Central nervous system (CNS): Your CNS is made up of your brain and spinal cord. On a basic level, it takes in, analyzes, and responds to internal and environmental information. Think of it as your body’s main communication hub.

  • Peripheral nervous system (PNS): Your PNS includes the rest of the nerve tissue outside of your brain and spinal cord. It helps to transmit information from your CNS to the rest of your body and vice versa. It also has two parts, which include your:

    • Somatic nervous system: Your somatic nervous system sends signals from your CNS to your skeletal muscles, which allow you to react to things in your environment.

    • Autonomic nervous system: Your autonomic nervous system controls your involuntary body functions, such as your heart rate, blood pressure, and digestion.

What are the different types of nervous system diseases?

There are more than 600 diseases that can impact your nervous system, according to the National Library of Medicine. These types of diseases are also referred to as neurological diseases.

A 2020 studyTrusted Source of neurological diseases in the United States found that the number of people with these diseases increased from 1990 to 2017. This is likely due to an aging population. The three diseases with the highest impact were:

  • stroke

  • Alzheimer’s disease and other dementias

  • migraine

There are many different types of neurological diseases.

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