同: 脊髄円錐

WordNet

in opposition to a proposition, opinion, etc.; "much was written pro and con"
an argument opposed to a proposal

PrepTutorEJDIC

…'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

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2018/01/26 09:35:27」(JST)

wiki en

The conus medullaris (Latin for "medullary cone") or conus terminalis 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"

UpToDate Contents

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1. 脊髄障害の解剖学および局在性 anatomy and localization of spinal cord disorders
2. 脊髄麻酔：手技 spinal anesthesia technique
3. 腰部脊柱管狭窄症：病態生理、臨床的特徴、および診断 lumbar spinal stenosis pathophysiology clinical features and diagnosis
4. 腰部脊柱管狭窄症：治療および予後 lumbar spinal stenosis treatment and prognosis
5. 急性腰仙部神経根障害：病態生理、臨床的特徴、および診断 acute lumbosacral radiculopathy pathophysiology clinical features and diagnosis

English Journal

Myxopapillary ependymoma in children: A study of 11 cases and a comparison with the adult experience.

Cimino PJ1, Agarwal A, Dehner LP.
Pediatric blood & cancer.Pediatr Blood Cancer.2014 Nov;61(11):1969-71. doi: 10.1002/pbc.25125. Epub 2014 Jul 25.
BACKGROUND: Myxopapillary ependymomas (MEPN) are uncommon tumors of the central nervous system, mainly occurring within the conus medullaris-filum terminale. MEPNs can also present in the skin and underlying soft tissues of the sacrococcygeal region. The incidence of extramedullary MEPNs in children
PMID 25066546

Ultrasound visibility of spinal structures and local anesthetic spread in children undergoing caudal block.

Shin S1, Kim JY2, Kim WO1, Kim SH3, Kil HK4.
Ultrasound in medicine & biology.Ultrasound Med Biol.2014 Nov;40(11):2630-6. doi: 10.1016/j.ultrasmedbio.2014.06.020. Epub 2014 Sep 12.
This study assessed ultrasound visibility of spinal structures in children and observed the extent of local anesthetic spread within the epidural space during caudal block. Spinal structures were evaluated with ultrasound from the sacral area to the thoracic area in 80 children, and drug spread leve
PMID 25220270

Periconal arterial anastomotic circle and posterior lumbosacral watershed zone of the spinal cord.

Gailloud P1, Gregg L1, Galan P1, Becker D2, Pardo C2.
Journal of neurointerventional surgery.J Neurointerv Surg.2014 Oct 3. pii: neurintsurg-2014-011408. doi: 10.1136/neurintsurg-2014-011408. [Epub ahead of print]
BACKGROUND: The existence of spinal cord watershed territories was suggested in the 1950s. Segmental infarcts within the junctional territories of adjacent radiculomedullary contributors and isolated spinal gray matter ischemia constitute two well-recognized types of watershed injury. This report de
PMID 25280570

Japanese Journal

脊髄円錐近傍から発生する髄内・髄外腫瘍に対する片側椎弓切除による腫瘍切除の適応基準 (日本脊椎・脊髄神経手術手技学会特集号)

Journal of spine research : official journal of the Japanese Society for Spine Surgery and Related Research 7(7), 1159-1163, 2016-07
NAID 40020923004

Spinal Intramedullary Ependymal Cyst in a 51-year Old Female : 10 years' Follow-up from Partial Resection (日本脊椎脊髄病学会特集号)

Journal of spine research : official journal of the Japanese Society for Spine Surgery and Related Research 6(9), 1416-1421, 2015-09
NAID 40020600893

1E45 FEMによる脊髄円錐症候群発症メカニズムの解明(OS5-4:臨床バイオメカニクスと医療デバイス(4))

バイオエンジニアリング講演会講演論文集 2015(27), 219-220, 2015-01-08
NAID 110009965320

「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]