nervous system

Topics: Nervous system, Spinal cord, Peripheral nervous system Pages: 4 (2383 words) Published: October 3, 2014
NERVOUS SYSTEM
The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Together, these organs are responsible for the control of the body and communication among its parts. The brain and spinal cord form the control center known as the central nervous system (CNS), where information is evaluated and decisions made. The sensory nerves and sense organs of the peripheral nervous system (PNS) monitor conditions inside and outside of the body and send this information to the CNS. Efferent nerves in the PNS carry signals from the control center to the muscles, glands, and organs to regulate their functions. Functions of the Nervous System

The nervous system has 3 main functions: sensory, integration, and motor.    Sensory. The sensory function of the nervous system involves collecting information from sensory receptors that monitor the body’s internal and external conditions. These signals are then passed on to the central nervous system (CNS) for further processing by afferent neurons (and nerves).  

Integration. The process of integration is the processing of the many sensory signals that are passed into the CNS at any given time. These signals are evaluated, compared, used for decision making, discarded or committed to memory as deemed appropriate. Integration takes place in the gray matter of the brain and spinal cord and is performed by interneurons. Many interneurons work together to form complex networks that provide this processing power.  

Motor. Once the networks of interneurons in the CNS evaluate sensory information and decide on an action, they stimulate efferent neurons. Efferent neurons (also called motor neurons) carry signals from the gray matter of the CNS through the nerves of the peripheral nervous system to effector cells. The effector may be smooth, cardiac, or skeletal muscle tissue or glandular tissue. The effector then releases a hormone or moves a...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Functions and Dysfunction of the Nervous System Essay
  • Nervous System and Terminal Buttons Essay
  • Essay on A Description of the Nervous System
  • Lab 8 Human Sensory Systems Essay
  • Saladin 6e Chapter 12 Nervous Tissue Essay
  • Essay on Nervous System
  • Nervous System Essay
  • Essay about Central Nervous System

Become a StudyMode Member

Sign Up - It's Free