Translations:Gastrointestinal tract/12/ja: Difference between revisions

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Created page with "====発達==== {{main/ja|Development of the digestive system/ja}} 腸はendoderm/ja内胚葉由来の構造である。ヒトの発生からおよそ16日目に、胚は2つの方向に腹側に折れ始める（胚の腹面が凹になる）：胚の側面は互いに折り込まれ、頭部と尾部は互いに向かって折れ曲がる。その結果、胚の腹側面に接しているendoderm/j..."
 
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Latest revision as of 09:00, 25 March 2024

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Message definition (Gastrointestinal tract)
====Development====
{{main|Development of the digestive system}}
The gut is an [[endoderm]]-derived structure. At approximately the sixteenth day of human development, the [[embryo]] begins to fold [[ventral]]ly (with the embryo's ventral surface becoming [[concave polygon|concave]]) in two directions: the sides of the embryo fold in on each other and the head and tail fold toward one another. The result is that a piece of the [[yolk sac]], an [[endoderm]]-lined structure in contact with the [[ventral]] aspect of the embryo, begins to be pinched off to become the primitive gut. The yolk sac remains connected to the gut tube via the [[vitelline duct]]. Usually, this structure regresses during development; in cases where it does not, it is known as [[Meckel's diverticulum]].

発達

詳細は「Development of the digestive system/ja」を参照

腸はendoderm/ja内胚葉由来の構造である。ヒトの発生からおよそ16日目に、胚は2つの方向に腹側に折れ始める（胚の腹面が凹になる）：胚の側面は互いに折り込まれ、頭部と尾部は互いに向かって折れ曲がる。その結果、胚の腹側面に接している内胚葉に覆われた構造物である卵黄嚢の一部が、原始的な腸になるためにつまみ出され始める。卵黄嚢は硝子管を介して腸管とつながったままである。通常、この構造は発生過程で退縮するが、退縮しない場合はメッケル憩室として知られる。

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