A 18-year-old female asked:
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which part of the spinal column has the narrowest canal for the cord to pass through?

2 doctor answers
Dr. Stuart Novack
54 years experience Rheumatology
Variable : As one ages the lumbar spine narrows more than the cervical spine;;injuries may contribute to the problem.
Answered on May 2, 2013
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Dr. Douglas Linville II
29 years experience Orthopedic Spine Surgery
Canal anatomy: The diameter of the bony spinal canal is largest c1-2, and then in the lumbar spine. The spinal cord ends at l1-2. Generally, the canal is relatively constant in diameter from the cervical to thoracic spine accommodating the cord and providing another 60% of its diameter as a buffer for spinal fluid and tissues. Average diameters are around 17mm throughout and considered critical if under 10 mm.
Answered on Oct 1, 2013
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