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Mnemonics, Simplified Concepts & Thoughts

Spinal segments vs Vertebral level

Epomedicine, Aug 9, 2023Aug 9, 2023

Last updated on August 9, 2023

Spinal segment: The part of spinal cord to which a pair of spinal nerves (right and left) is attached.

Cause of mismatch between spinal segments and vertebral level:

  • The spinal cord lags in growth compared to the vertebral column after 3rd embryonic month
  • Spinal cord is shorter (45 cm) compared to the vertebral column (65 cm)
  • Spinal segments always lie above their numerically corresponding vertebral spines
spinal cord segments

General rule:

Vertebral levelAddSpinal segment
Cervical+ 0Same
C7-T1C8
T1-T3+1T1-T4
T3-T6+2T5-T8
T7-T8+3T9-T11
T8-T9T12
T9-T11Lumbar
T12-L1/2Sacral

During clinical examination, when you get any sensory level, always consider this longitudinal discrepancy between cord level and vertebral level.

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PGMEE, MRCS, USMLE, MBBS, MD/MS AnatomyClinical examinationNervous system

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Epomedicine. Spinal segments vs Vertebral level [Internet]. Epomedicine; 2023 Aug 9 [cited 2025 May 10]. Available from: https://epomedicine.com/medical-students/spinal-segments-vs-vertebral-level/.

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