The divisions and main structures of the nervous system
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The Divisions and Main Structures of the Nervous System. Hwa Won and Samuel. Vocabulary. Brain : main part of central nervous system made of about 100 billion neurons Nerve : Bundle of nerve fibers that carry sensory information

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  • Brain: main part of central nervous system made of about 100 billion neurons

  • Nerve: Bundle of nerve fibers that carry sensory information

  • Spinal cord: Thick whitish nerve tissue enclosed by vertebrae that links brain to most nerves

  • Cerebellum: largest part of brain that works over the senses and causes skeletal muscles to move and complex mental processes

  • Reflex: automatic response that comes out very quickly without control of the brain.

The brain
The Brain

  • Contains about 100 billion neurons

  • The skull, 3 layers of connective tissue, and fluid help protecting brain

The cerebellum
The Cerebellum

  • Keep balance of body

  • Organize body and thought in coordinate way


  • Control body’s automatic actions (i.e. breathing/ heart beating)

The central nervous system
The Central Nervous System

  • It is like a control center of the body

  • Spinal cord links the central nervous system with the peripheral nervous system

  • Brain is a part of the central nervous system

  • The nerves in your body work like a network of interconnected wires

The peripheral nervous system
The Peripheral Nervous System

  • Network of nerves other than central nervous system

  • Connect nerves from central nervous system to whole body

  • Impulse travel through spinal nerve in 2 directions

     To/ from central nervous system

The peripheral nervous system continued
The Peripheral Nervous System (continued)

  • Somatic nervous system control voluntary actions

    (i.e. using fork/ tying shoelaces)

  • Automatic nervous system control involuntary actions

    (i.e. regulating smooth muscles)

The spinal cord
The Spinal Cord

  • The vertebral column (backbone) surrounds it and therefore protects it

  • It links the brain and the peripheral nervous system

  • It is also protected by a watery fluid

  • It is about 45 cm long in men and about 43 cm in women


  • A rapid, involuntary response to a thread

  • Sometimes only the spinal cord is involved (no brain involvement)

  • Used for protection, i.e. a burn after you touch a hot surface

  • As your muscles contract, another impulse goes from your handto your brain, simultaneously

  • This impulse makes you feel pain

Safety and the nervous system
Safety and the Nervous System

  • Just like any other part of your body the nervous system can be easily damaged

  • Concussion – an injury of the brain, when the cerebrum hits the skull

    • Occurs if you hit your head very hard

    • Sometimes heals itself, but if not and uncured it can cause brain damage

    • Wearing a helmet can prevent concussion in activities such as sports

  • Spinal cord can be easily injured, too

    • Occurs when the vertebrae is injured

    • Very dangerous, it can paralyze body parts or even the whole body

Wear a Helmet!