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Spinal Dura (Sacral)
Nervous System

Spinal Dura (Sacral)

Dura spinalis

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The spinal dura mater is a tough fibrous membrane that protects and encloses the spinal cord. It arises at the foramen magnum, to which it is attached. It also blends with the posterior aspects of the bodies of the second and third cervical vertebrae and to the posterior longitudinal ligament. Otherwise, it forms a distinctive layer that is separated from the tissues surrounds the vertebral column by an epidural space. Deep to the spinal dura is the subdural space, a potential space that separates it from the spinal arachnoid.

Distally, at around the level of the second sacral vertebra, the dura begins to taper and invests the thin, delicate filum terminale internum to form the filum terminale externum (or the coccygeal ligament). It descends to the posterior coccyx to blend with its periosteum.

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Key Features/Anatomical Relations

The spinal dura mater forms the dural sac, running from the foramen magnum rostrally to the S2 vertebrae caudally. The spinal dura extends laterally with nerve roots to cover nerves as they emerge from the spinal canal. The dura mater blends with the epineurium of the spinal nerves.

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