Double spinal dural sheath: a cadaveric case report
نویسندگان
چکیده
The spinal dura mater is a dense inelastic membrane which forms a loose sheath around the spinal cord. It is attached to the circumference of the foramen magnum, and the posterior surface of the bodies of the second and third cervical vertebrae. At the level of the second sacral vertebra it invests the filum terminale and descends to the posterior aspect of the coccyx, where it blends with the periosteum. The embryological origin of the dura is unclear, arising either separately to the pia and arachnoid layers (dura from the pachymeninx, arachnoid and pia from the leptomeninges) or a common origin [1]. There are several reported anatomical variants of the dural sheath, including areas of localised duplication on its ventral aspect [2,3]. However, these have only been observed during intra-operative dissection and were then associated with idiopathic herniation of the spinal cord. The present case study describes a complete duplication of the spinal dura mater in an otherwise ‘healthy’ cadaver, a previously undocumented variation. It is of clinical interest in spinal surgery, particularly in relation to idiopathic spinal cord herniation.
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