<prompt> Filum terminate extend up toS5L5CoccyxL4  <response>: C Coccyx Level of Spinal Cord: Spinal cord extends from C1 to L1 lower border in adults Spinal cord extends from C1 to L3 upper border in infants. Filum terminate extends from lower end of spinal cord L1 or L3 to the tip of coccyx. Piamater extends up to tip coccyx Dural sheath extends up to S2 vertebra. Subdural space extends up to S2 Subarachnoid space extends up to S2 