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・ Conus malacanus
・ Conus malcolmi
・ Conus maldivus
・ Conus mappa
・ Conus marchionatus
・ Conus marcocastellazzii
・ Conus mariaodeteae
・ Conus marielae
・ Conus marileeae
・ Conus marmoreus
・ Conus martensi
・ Conus martinianus
・ Conus maya
・ Conus mcbridei
・ Conus medoci
Conus medullaris
・ Conus medvedevi
・ Conus melissae
・ Conus melvilli
・ Conus mercator
・ Conus messiasi
・ Conus miamiensis
・ Conus micropunctatus
・ Conus miguelfiaderoi
・ Conus miles
・ Conus milesi
・ Conus miliaris
・ Conus milneedwardsi
・ Conus miniexcelsus
・ Conus minimus


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Conus medullaris : ウィキペディア英語版
Conus medullaris

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 tension that the filum terminale provides between the conus medullaris and the coccyx stabilizes the entire spinal cord.〔http://medical-dictionary.thefreedictionary.com/Filum+terminale〕
==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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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