Anatomy of the ANS

Anatomy of the ANS - AnatomyoftheANS...

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Anatomy of the ANS  The two systems are distinguished by:  1. Unique origin sites - parasympathetic fibers emerge from the cranial and sacral regions of the  spinal cord. The sympathetic fibers originate from the thoracolumbar region of the spinal cord.  2. Different lengths of their fibers: parasympathetic has long preganglionic and short  postganglionic fibers. The sympathetic has the opposite condition.  3. Location of their ganglia: most parasympathetic ganglia are located in the visceral effector  organs. Sympathetic ganglia lie close to the spinal cord.  Parasympathetic Division  Originates from cranial and sacral regions of spinal cord (craniosacral).  The preganglionic axons extend from the CNS nearly all the way to the target structures where  they synapse with postganglionic neurons located in terminal ganglia that are within or very  close to the target organs. 
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This note was uploaded on 11/22/2011 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Anatomy of the ANS - AnatomyoftheANS...

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