How deep is the epidural space?

The epidural space is located between the outer covering of the spinal cord (the dura mater) and the vertebral canal. Its depth varies along the spine, typically ranging from about 3 to 5 millimeters in the cervical region to approximately 5 to 10 millimeters in the lumbar region. The exact depth can differ based on individual anatomical variations and the specific location along the spine.