Ans. b. L1 Ref: Grays Anatomy, 4l'' ed., pg. 762-763In the adult, the spinal cord terminates on average at the level of the middle third of the body of the first lumbar veebra which corresponds approximately to the transpyloric plane.Spinal cord extends from C I to L I (lower border) in adults.Filum terminale extends from lower end of spinal cord to the tip of coccyx.Dural sheath extends up to 52 veebrae.Subdural space extends up to 52.Subarachnoid space extends up to 52.Piamater extends up to tip of coccyx.
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