Jejunum - jejunum

Japanese: 空腸 - くうちょう（英語表記）jejunum

The digestive tract belongs to the small intestine and is located between the duodenum and ileum. The lumen is 3 to 5 cm in diameter, and the intestinal wall consists of four layers: mucosa, submucosa, muscular layer, and serosa. The jejunum exhibits peristaltic, pendular, and segmental movements, and the vagus nerve acts to promote and the sympathetic nerve acts to inhibit. Intestinal juices are secreted from the intestinal glands scattered in the mucosa, and participate in the digestion of each nutrient. In this section, water, alcohol, monosaccharides, amino acids, salts, and some fatty acids are absorbed from the capillaries of the villi into the portal vein system, and most fatty acids enter the bloodstream through the lymphatic vessels of the villi through the thoracic duct.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

小腸に属し，十二指腸と回腸の間に位置する消化管。内腔は直径3～5cmで，腸壁は粘膜，粘膜下層，筋層，漿膜の4層から成る。空腸にはぜん動，振子運動，分節運動があり，迷走神経は促進的に，交感神経は抑制的に働く。粘膜に散在する腸腺からは腸液が分泌され，各栄養素の消化にあずかる。また，この部では水，アルコール，単糖類，アミノ酸，塩類および脂肪酸の一部が絨毛の毛細血管から門脈系に吸収され，脂肪酸の大半は絨毛のリンパ管から胸管を通って血液中に入る。

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