Where is the Thecal Sac Located?

In the lumbar spine, there is no spinal cord to protect the nerves. Because of this, the nerve roots hang down from the lumbar spine in an enclosed cerebral spinal fluid filled sac, called the Thecal Sac. The Thecal sac's function is to protect and provide nutrients to the nerve roots You can find more information here: http://www.chirogeek.com/000_disc_anatomy.htm
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