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

  1. ^ "Medcyclopaedia - Conus medullaris syndrome". http://www.medcyclopaedia.com/library/topics/volume_iii_1/c/conus_medullaris_syndrome.aspx. Retrieved 2007-11-22. 

External links

v · d · eAnatomy of torso (primarily): the spinal cord (TA 14.1.02, GA 9.749)
External, dorsal
Posterior median sulcus · Posterolateral sulcus
Grey matter/
Rexed laminae
VII: Lateral horn
VIII–IX: Anterior horn
X: Other
Central gelatinous substance · Gray commissure
Central canal
White matter
somatic/
ascending
(blue)

Posterior/PCML: touch: Gracile · Cuneate

Lateral: proprioception: Spinocerebellar (Dorsal, Ventral) · pain/temp: Spinothalamic (Lateral, Anterior) · Posterolateral (Lissauer) · Spinotectal

Spinoreticular tract · Spino-olivary tract
motor/
descending
(red)
both
External, ventral
Anterior median fissure · Anterolateral sulcus
External, general

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)

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  • 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

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  • 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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