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The Peripheral Nervous System 10th grade Biology
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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
reactions.
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
PNS
Sensory Division
Somatic Sensory Division
Visceral Sensory Division
Motor Division
ANS
Parasympathetic System
Sympathetic System
Somatic Motor Division
CNS
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 http://psychology.about.com/od/sindex/f/somatic-nervous-system.htm
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 http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/PNS.html
The Peripheral Nervous System And Reflexes . (n.d.).The Peripheral Nervous System And Reflexes . Retrieved April 25, 2011, from course1.winona.edu/JLoewen/21
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