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1 omphaloskepsis - Contemplation of one's navel as an aid to meditation.  navel, umbilicus, belly button, omphalodium - The navel is also the umbilicus, belly button, or omphalodium; navel and umbilicus share the same Indo-European root.
What is a Thecal Sac: Definition and Structure: The thecal sac is a covering of the spinal canal that is filled with cerebrospinal fluid (CSF).It houses the spinal cord and nerve roots.It is made up of outer arachnoid membrane and inner dura. It is wider in females.he thecal sac is a covering of the spinal canal that is filled with cerebrospinal fluid (CSF). It houses the spinal cord and nerve roots. It is made up of outer arachnoid membrane and inner dura.