Spinal anatomy: neonatal

Advanced, Clinical Subspecialties

The spinal cord terminates with the conus medullaris located at L3 until 1 year of age. This is in comparison to L1 in adults.

The dural sac extends to S3 in infants compared to S1/S2 in adults.


    “Regional Anesthesia.” A Practice of Anesthesia for Infants and Children, by Coté Charles J. et al., Elsevier, 2019.

    “Spinal, Epidural, & Caudal Blocks.” Clinical Anesthesiology, by Butterworth John F. et al., McGraw-Hill Education, 2018.


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Samantha Smith, MD