The Peripheral Nerv ous System

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The Peripheral Nervous System 10th grade Biology


  • N I C O L E B L A K E M A N

    L . L L A V I N A

    B I O L O G Y

    1 0 T H A D V .

    Peripheral Nervous System

  • Nervous System

    The nervous system is divided into two different parts: Central Nervous System (CNS) & the Peripheral Nervous System (PNS).

    The CNS consists of the brain and spinal cord, and the PNS is all other nerve tissue.

    The PNS carries information between the CNS and the other organs.

  • Peripheral Nervous System

    The human PNS includes: 31 pairs of Spinal Nerves

    12 pairs of Cranial Nerves

    Cells in the PNS are both: Sensory Neurons: Coordinate functions of internal organs and

    provide the CNS with sensory information.

    Motor Neurons: Enable an organism to respond to its environment by stimulating muscle contraction and the activities of glands.

  • Subsystems of the PNS

    The two major divisions of the PNS are: Sensory Division

    Motor Division

    Motor Division Subsystems: Automatic Nervous System (ANS): Regulates involuntary


    Somatic Motor Division: Responsible for skeletal muscle contraction.

    Sensory Division Subdivisions: Visceral (Internal Organs) Sensory Division: Carries signals

    mainly from the viscera of the thoracic and abdominal cavities.

    Somatic Sensory Division: Carries signals from receptors in the skin, muscles, bones and joints.

  • Automatic Nervous System

    Automatic Nervous System:

    Sympathetic Division

    Parasympathetic Division

    The Sympathetic Division prepares an animal for quick reactions.

    The Parasympathetic Division reduces readiness for action.

  • Automatic Nervous System

  • Nervous System

    Nervous System


    Sensory Division

    Somatic Sensory Division

    Visceral Sensory Division

    Motor Division


    Parasympathetic System

    Sympathetic System

    Somatic Motor Division


  • References

    BSCS Biology A Molecular Approach (pp. 551 - 553). (2006). Nervous Systems. Columbus, Ohio: Glencoe/McGraw-Hill.

    Cherry, K. (n.d.). Somatic Nervous System - What Is the Somatic Nervous System.Psychology - Complete Guide to Psychology for Students, Educators & Enthusiasts. Retrieved May 1, 2011, from

    The Peripheral Nervous System. (2011, March 2). RCN D.C. Metro | High-Speed Internet, Digital Cable TV & Phone Service Provider. Retrieved May 1, 2011, from

    The Peripheral Nervous System And Reflexes . (n.d.).The Peripheral Nervous System And Reflexes . Retrieved April 25, 2011, from


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