About Lifelong Learning - Contact Us - DonateFree-Ed.Net Home   Bookmark and Share

 

Major content provider: U.S. National Cancer Institute

anatomy01.jpg (2812 bytes)

Nervous System: Unit Review and Quiz

 

Here is what we have learned from this unit:

  • The nervous system is the major controlling, regulatory, and communicating system in the body. It is the center of all mental activity including thought, learning, and memory.
  • The various activities of the nervous system can be grouped together as three general, overlapping functions: sensory, integrative, and motor.
  • Neurons are the nerve cells that transmit impulses. Supporting cells are neuroglia.
  • The three components of a neuron are a cell body or soma, one or more afferent processes called dendrites, and a single efferent process called an axon.
  • The central nervous system consists of the brain and spinal cord. Cranial nerves, spinal nerves, and ganglia make up the peripheral nervous system.
  • The afferent division of the peripheral nervous system carries impulses to the CNS; the efferent division carries impulses away from the CNS.
  • There are three layers of meninges around the brain and spinal cord. The outer layer is dura mater, the middle layer is arachnoid, and the innermost layer is pia mater.
  • The spinal cord functions as a conduction pathway and as a reflex center. Sensory impulses travel to the brain on ascending tracts in the cord. Motor impulses travel on descending tracts.

 

David L. Heiserman, Editor

Copyright   SweetHaven Publishing Services
All Rights Reserved

Revised: June 06, 2015