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The conus medullaris (medullary cone) is the cone-shaped terminal portion of the spinal cord. The tip of the conus medullaris is found between the L1 and L2 vertebra in the average adult. The conus medullaris is tethered to the coccyx by a fibrous cord called the filum terminale, which stabilises the distal end of the spinal cord. Distal to the conus medullaris is a collection of spinal nerve roots called the cauda equina, that emerges from the lumbosacral part of the spinal cord below the L1 ve