That's called the cauda equina because it resembles a horses
tail.
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Cauda equina is the roots of the spinal nerves controlling
movement and sensation in the legs. These nerve roots are located
in the lower spine and resemble a horse's tail (cauda equina in
Latin).
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Horse's tail
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Cauda Equina is a bundle of spiral nerves and spinal nerve root
-PAula and Jand
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i develop cauda equina syndrome post laminectomy with rupture of
the spinal cor membrane dura madre