The<unk><unk>  (Latin for "horse's tail") begins at the 2nd Lumbar space extending down to the beginning of the sacral nerves.  It is distal to the tapered end of the spinal cord, or conus medularis.
Syndromes
Spinal cord injury
Spinal cord compression (non-traumatic)<unk> 
Conus medullaris syndrome
Causes
Spinal cord injury
Epidural abscess (spinal)
Epidural hematoma (spinal)
Syringomyelia
Spinal cord injury
Spinal cord compression (non-traumatic)<unk> 
Conus medullaris syndrome
Spinal cord injury
Epidural abscess (spinal)
Epidural hematoma (spinal)
Syringomyelia
Cauda equina syndrome
Spine related
Central cord syndrome
Acute ligamentous injury
Conus medullaris syndrome
Acute muscle strain
Lateral medullary syndrome
Disk herniation 