The cauda equina is a structure within the lower end of the spinal column, that consists of nerve roots and rootlets from above.

Because the spinal cord stops growing in infancy while the bones of the spine continue growing, the spinal cord, in adults ends at about the level of the vertebra L2, and at birth at L3. To get through the intervertebral foramen at the correct segment, the roots must travel down the length of the spine.

All these roots and rootlets down the vertebral column give the appearance of a horse's tail, which is the meaning of the Latin name cauda equina.

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Spinal cord

Cauda equina