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navel - the center point or middle of something; the Incas believed that Cuzco was the navel of the universe. navel point. midpoint, centre, center - a point equidistant from the ends of a line or the extremities of a figure.
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.