Dural Sac Termination S2 — FRCA Primary MCQ

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EasyAnatomyDural Sac Termination S2FRCA Primary

The subarachnoid space terminates inferiorly at approximately which level in adults?

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Correct answer: C — S2

The subarachnoid space extends from the foramen magnum to approximately S2. Below the conus medullaris (L1-L2) it contains CSF and cauda equina. This is relevant for lumbar puncture performed at L3/4 or L4/5.

Reference: RCoA 2021 Primary FRCA Curriculum