Between which gestational ages does the spinal cord termination ascend from L4 to L2?

Between which gestational ages does the spinal cord termination ascend from L4 to L2?

• A. 25-40 weeks
• B. 0-12 weeks
• C. 40-52 weeks
• D. 2-3 months post-term

Answer: (A)

The main idea is that the spinal cord ends higher as the fetus develops because the vertebral column grows faster than the spinal cord. Early in gestation, the conus medullaris sits lower (around L4). As late gestation progresses, the spinal cord doesn’t lengthen as quickly as the spine does, so the termination moves upward relative to the vertebral levels. By late gestation, roughly between twenty-five and forty weeks, the conus ascends from L4 toward L2. By birth it’s around L2–L3, and in adults it’s typically around L1–L2. That’s why late-gestation timing fits the ascent from L4 to L2 most accurately.

The main idea is that the spinal cord ends higher as the fetus develops because the vertebral column grows faster than the spinal cord. Early in gestation, the conus medullaris sits lower (around L4). As late gestation progresses, the spinal cord doesn’t lengthen as quickly as the spine does, so the termination moves upward relative to the vertebral levels. By late gestation, roughly between twenty-five and forty weeks, the conus ascends from L4 toward L2. By birth it’s around L2–L3, and in adults it’s typically around L1–L2. That’s why late-gestation timing fits the ascent from L4 to L2 most accurately.