cauda equina

noun
cauda equi·​na | \ -ek-ˈwē-nə How to pronounce cauda equina (audio) , -ē-ˈkwī-nə How to pronounce cauda equina (audio) \
plural caudae equinae\ -​ek-​ˈwē-​ˌnī, -​ē-​ˈkwī-​ˌnē How to pronounce caudae equinae (audio) \

Medical Definition of cauda equina

: the roots of the spinal nerves that extend beyond the termination of the spinal cord at the first lumbar vertebra in the form of a bundle of filaments within the spinal canal resembling a horse's tail From its tip at the base of the spine, about 20 stringy nerves—called the cauda equina, or horse's tail—travel downward within a fluid-filled sac.— Bruce H. Dobkin

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