…It is named after the length of the human rectum, which is about the length of 12 fingers placed side by side, but it is actually a little longer, measuring 25 to 30 cm. It has a tubular structure, beginning in the front and right of the first lumbar vertebra, running slightly to the right and rear (first part, bulb), then descending at a steep angle (second part, descending part), bending again at the height of the third lumbar vertebra, running to the left in front of the aorta and vena cava (third part, horizontal part), then ascending slightly (fourth part, ascending part), bending at the ligament of Treitz in the front and left of the second lumbar vertebra, to become the jejunum. Overall, it has a C-shape, with the head of the pancreas attached to the inside of the loop. … *Some of the terminology explanations that mention the "Ligament of Treitz" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ヒトのそれが指を12本横に並べた長さがあるというところからこの名があるが,実際はそれよりやや長く25~30cmある。管状の構造をもち,第1腰椎付近の前右方に始まり,やや右後方へ走行(第1部,球部)したのち急角度で下行(第2部,下行部)して,第3腰椎付近の高さで再び屈曲して,大動脈,大静脈の前を左方へ走り(第3部,水平部),そこからやや上行(第4部,上行部)して第2腰椎付近の左前方,トライツ靱帯(じんたい)ligament of Treitzのところで屈曲して空腸となる。全体としてC字状を呈し,ループ内側に膵頭部が接している。… ※「ligament of Treitz」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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