A highly complex network involving nuclei and nerve fibers in the brain stem is known as reticular formation. The network also helps to create the reticular activating system that brings the cerebrum. The network known as reticular formation is spread throughout the spinal cord, the midbrain, the pons, the thalamus, and the hypothalamus. The majority of structures within the brain sends and accepts fibers which ascend and descend throughout the reticular formation. Unless they receive interference from other portions within the brain, the nuclei of the reticular formation send continuous impulses throughout the entire formation. The reticular activating system is responsible for the chronic state of alertness of the cerebrum. It also selectively monitors the type and amount of sensory perception received by the cerebrum. The additional responsibility of the reticular formation is to send impulses which allow the cerebellum to coordinate continuous and smooth motor skeletal muscle motion.
Reticular formation videos
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How the Body Works : The RAS Pathway
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http://www.youtube.com/v/kbYmeVBH2dA
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How the Body Works : Altered States
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http://www.youtube.com/v/YdQEyDDcRu8
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Reticular formation
