Dural sac: Caudal extent


In an adult the dural sac terminates caudally at S2 . The termination of the adult spinal cord, on the other hand, is at L1-2 and is called the conus medullaris .

In newborns the dura mater ends at S3 , and the conus medullaris at L3. This changes over the first year of life.

Spinal Anatomy (Adults)

  • Dural Sac: S2
  • Spinal cord: L2 (conus medullaris )

Spinal Anatomy (Newborns)

  • Dural Sac: S3
  • Spinal cord: L3 (conus medullaris )