Cauda equina


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Cauda equina (Wikipedia)
Cauda equina
Gray662.png
Cauda equina and filum terminale seen from behind.
Human caudal spinal cord anterior view description.jpg
Human caudal spinal cord anterior view
Details
ArteryIliolumbar artery
Identifiers
LatinCauda equina
MeSHD002420
TAA14.2.00.036
FMA52590
Anatomical terminology

The cauda equina (from Latin horse's tail) is a bundle of spinal nerves and spinal nerve rootlets, consisting of the second through fifth lumbar nerve pairs, the first through fifth sacral nerve pairs, and the coccygeal nerve, all of which arise from the lumbar enlargement and the conus medullaris of the spinal cord. The cauda equina occupies the lumbar cistern, a subarachnoid space inferior to the conus medullaris. The nerves that compose the cauda equina innervate the pelvic organs and lower limbs to include motor innervation of the hips, knees, ankles, feet, internal anal sphincter and external anal sphincter. In addition, the cauda equina extends to sensory innervation of the perineum and, partially, parasympathetic innervation of the bladder.

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