The conus medullaris is the terminal end of the spinal cord. It occurs near lumbar nerves 1 (L1) and 2 (L2). After the spinal cord terminates, the spinal nerves continue as dangling nerves called the cauda equina. The upper end of the conus medullaris is usually not well defined.
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Conus Medullaris or Medullary Cone is attached to the spinal cord. It is where the spinal cord thins out on its lower end.