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Name	Current message text
^h English (en)	====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]].
^h Japanese (ja)	====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、[[embryo/ja\|胚]]は2つの方向に[[ventral/ja\|腹側]]に折れ始める（胚の腹面が[[concave polygon/ja\|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[[ventral/ja\|腹側]]面に接している[[endoderm/ja\|内胚葉]]に覆われた構造物である[[yolk sac/ja\|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[[vitelline duct/ja\|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[[Meckel's diverticulum/ja\|メッケル憩室]]として知られる。