Human Anatomy Levels of Organization Nervous System

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Levels of Organization Nervous System http://www.everydayhealth.com/healthy-living-pictures/the-nervous-system.aspx By: Carrie Terwilliger

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The nervous system consists of two main systems: the central nervous system and the peripheral nervous system. Central Nervous System Peripheral Nervous System Contains the brain and the spinal cord. The brain receives information from the body and sends out instructions to the body through sensory input Contains nerve cells that are through out the body. The nerve cells are divided into two groups of nerve cells: Sensory – get information from the body through sensory input and send it to the brain Motor – send instructions from the brain to neurons around the body to muscles. They also react to stimuli The Nervous System

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Nervous System Cells The nervous system contain two main types of cells: Neurons Supporting Cells Nerve cells that transmit messages through the body. Cells that help, protect, and insulate the neurons.

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Neurons Neurons consist of: dendrites – are branches off of the cell body. They receive messages from other neurons. a cell body – contains the cells nucleus an axon – carries the messages from the cell body to the axon terminals. axon terminals- transmit messages across the synapse to send the messages to the other neurons http://www.mindcreators.com/NeuronBasics.htm

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Supporting Cells An example of supporting cells are: Glial Cells Surround, support, and insulate neurons. They perform many functions for neurons such as making myelin sheath, digest dead parts of the neuron, and provide nutrition for the neuron. Some examples of glial cells are Schwann's Cells, Satellite Cells, Oligodendroglia, Microglia and Astroglia. http://library.thinkquest.org/C0126536/main.php?currentchap=1&currentsect=neuron.htm&pagenum=6

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Nervous System Tissue Neurons and glial cells make up nervous tissue. Nervous tissue conducts electric impulses in the body and reacts to stimuli. Nerve tissue in the brain, spinal cord, and peripheral nerves that branch throughout the body are all made up of neurons http://www.occc.edu/biologylabs/documents/cells%20membranes/Nervous_tissue.htm

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Nervous System Organs Brain Spinal Cord The brain is the center of the nervous system. The brain receives messages from the nerves around the body and sends out information to the nerves in the body. The brain is made of neurons. The brain communicates through the spinal cord. The spinal cord is a bundle of nerves that connect the brain to the rest of the body. http://www.cedars-sinai.edu/Patients/Programs-and-Services/Spine-Center/Anatomy-of-the-Spine/Images/468380_SPINALCO_copy.jpg

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http://library.thinkquest.org/2935/Natures_Best/Nat_Best_High_Level/Title_Net_Page/Title_page_h.html http://library.thinkquest.org/5777/ner1.htm http://www.wisegeek.com/what-is-nervous-tissue.htm http://www.enchantedlearning.com/subjects/anatomy/brain/Neuron.shtml http://www.cellsalive.com/gallery.htm http://www.mhhe.com/biosci/ap/histology_mh/nervtis.html http://www.everydayhealth.com/healthy-living-pictures/the-nervous-system.aspx http://www.bartleby.com/107/183.html http://library.thinkquest.org/C0126536/main.php?currentchap=1&currentsect=neuron.htm&pagenum=6 http://www.emc.maricopa.edu/faculty/farabee/biobk/biobooknerv.html#The Brain Bibliography

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