Conus medullaris

Conus medullaris
Conus medullaris
Gray662.png
Cauda equina and filum terminale seen from behind. The dura mater has been opened and spread out, and the arachnoid mater has been removed.
Gray's subject #185 749

The conus medullaris ("medullary cone") is the terminal end of the spinal cord. It occurs near lumbar vertebral levels 1 (L1) and 2 (L2). After the spinal cord tapers out, the spinal nerves continue as dangling nerve roots called cauda equina. This terminal nerve root tail is referred to as the filum terminale. The upper end of the conus medullaris is usually not well defined.

Contents

Blood supply

The blood supply consists of three spinal arterial vessels -- the anterior median longitudinal arterial trunk and two posterolateral trunks. Other less prominent sources of blood supply include radicular arterial branches from the aorta, lateral sacral arteries, and the fifth lumbar, iliolumbar, and middle sacral arteries. The latter contribute more to the vascular supply of the cauda equina.

Pathology

Conus medullaris syndrome is a collection of signs and symptoms associated with injury to the conus medullaris.[1]

References

External links


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Look at other dictionaries:

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  • conus medullaris — conus med·ul·lar·is .med əl er əs, .mej ə ler n a tapering lower part of the spinal cord at the level of the first lumbar segment * * * the conical end of the spinal cord, at the level of the lower end of the first lumbar vertebra. * * * [TA]… …   Medical dictionary

  • conus medullaris syndrome — a group of symptoms caused by compression of the conus medullaris, with diminished control of bowel and bladder functions, pain in the lower back, anesthesia in the pelvic region, and sometimes weakness in the lower limbs …   Medical dictionary

  • conus medullaris — the conical end of the spinal cord, at the level of the lower end of the first lumbar vertebra …   The new mediacal dictionary

  • conus medullaris — ˌmedyu̇ˈlerə̇s, ˌmejəˈ noun Etymology: New Latin, literally, medullary cone : a tapering lower part of the spinal cord at the level of the first lumbar segment …   Useful english dictionary

  • Conus (disambiguation) — Conus may refer to: Conus, a genus of marine snails Conus (Marietta, Ohio), a prehistoric Moundbuilders mound located at Mound Cemetery in Marietta, Ohio, aka Great Mound or Mound Cemetery Mound (NRHP site #73001549) CONUS, Contiguous United… …   Wikipedia

  • medullaris — see CONUS MEDULLARIS …   Medical dictionary

  • conus — [ kəʊnəs] noun (plural coni nʌɪ) Anatomy 1》 (also conus arteriosus α:ˌtɪərɪ əʊsəs) the upper front part of the right ventricle of the heart. 2》 (also conus medullaris ˌmɛdə lα:rɪs) the conical lower extremity of the spinal cord. Origin C19: from… …   English new terms dictionary

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