What is the nervous system?
The nervous system is a type of an organ system.

What does a nervous system do? 
The nervous system uses neurons to send electrical signals, or messages, to and from the brain, skin, organs, glands, and muscles. (1)

What are parts of a nervous system?
brain (2) 
    cerebrum (2)
        cerebral hemispheres (2)
    diecephalon or interbrain(2)
        thalamus (2)
        hypothalamus (2)
    midbrain (2)
    cerebellum (2)
    pons (2)
    medulla oblongata (2)
spinal cord (2)
ventricular system (2)
    choroid plexis (2)
central nervous system (CNS) (1)
peripheral nervous system (1)
neurons (1, 3)
glial cells (3)

Resources
1. https://my.clevelandclinic.org/health/articles/21202-nervous-system
2. https://en.wikipedia.org/wiki/List_of_organs_of_the_human_body
3. https://www.bioexplorer.net/nerve-cell-types.html/

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