WordNet

make cone-shaped; "cone a tire"
a shape whose base is a circle and whose sides taper up to a point (同)conoid, cone shape
cone-shaped mass of ovule- or spore-bearing scales or bracts (同)strobilus, strobile
any cone-shaped artifact
a visual receptor cell in the retina that is sensitive to bright light and to color (同)cone cell, retinal cone
in opposition to a proposition, opinion, etc.; "much was written pro and con"
an argument opposed to a proposal
of or relating to the medulla of any body part
containing or consisting of or resembling bone marrow
of or relating to the medulla oblongata
the inner part of an organ or structure in plant or animal

PrepTutorEJDIC

円すい,円すい形 / 円すい形のもの / 球果(松かさなど)・暴風警報球.
…'を'よく研究する
反対して / 反対投票,反対論
〈人〉'を'ペテンにかける
=convict
=confidence trick
〈U〉骨髄 / =medulla oblongata

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/12/20 07:30:18」(JST)

wiki en

The conus medullaris (Latin for "medullary cone") is the tapered, lower end of the spinal cord. It occurs near lumbar vertebral levels 1 (L1) and 2 (L2), occasionally lower. The upper end of the conus medullaris is usually not well defined.

After the spinal cord tapers out, the spinal nerves continue to branch out diagonally, forming the cauda equina.

The pia mater that surrounds the spinal cord, however, projects directly downward, forming a slender filament called the filum terminale, which connects the conus medullaris to the back of the coccyx. The filum terminale provides a connection between the conus medullaris and the coccyx which stabilizes the entire spinal cord.^[1]

Blood supply

The blood supply consists of three spinal arterial vessels— the anterior median longitudinal arterial trunk and the right and left posterior spinal arteries. 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.^[2] It typically causes back pain and bowel and bladder dysfunction but weakness and sensory loss is uncommon. Comparatively, cauda equina syndrome may cause radicular pain, bowel/bladder dysfunction, saddle anesthesia and lower extremity weakness at the level of the lumbar and sacral roots.

References

^ http://medical-dictionary.thefreedictionary.com/Filum+terminale
^ "Cauda Equina and Conus Medullaris Syndromes- MedScape-Reference".

External links

Atlas image: n3a2p5 at the University of Michigan Health System - "Lower Third of Spinal Cord, MRI"

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「脊髄円錐」

Conus medullaris
	Cauda equina and filum terminale seen from behind. The dura mater has been opened and spread out, and the arachnoid mater has been removed.
Identifiers
TA	A14.1.02.004
FMA	74897
	Anatomical terminology [edit on Wikidata]