Small intestine

The small intestine is the part of the human digestive system located between the Estomac and the large intestine (Côlon). It includes/understands a fixed segment, the Duodénum, followed by two mobile segments, the Jéjunum then the Iléon. It is mainly located in the stage under-mésocôlique of the abdomen, but its initial part, the duodenum, can be considered pertaining on the two floors known and under-mésocôlique because of its crossing by the root of the transverse Mésocôlon.

The small intestine is the principal place of absorption of the nutrients by the organization: it develops in length to offer a maximum of surface of absorption. The mobile small intestine (jejunum + iléon) is very mobile because of its very long Méso: the Mésentère , blade carry-vessels.

The small intestine is made of kind to amplify the processes of absorption:

Its length is of 7 meters.
the increase in its surface by the connivent valvules or valvules of Kerckring, folds of the Mucous and the submucosa covered with villosities, themselves covered with microvillosities (surface of approximately 250 square meters = tennis court).
the presence of intestinal villosities, which are folds of the chorion mucous membrane
the presence of Microvillosité S with the apical pole of the entérocytes.
intestinal secretions have a pH with 8.

It is in the small intestine that is held intestinal absorption,

glucose, the amino-acids and the fatty-acids pass from the intestinal light to the blood-vessels.
the fatty-acids and the glycerol pass in the lymphatic vessels.
water, rock salt and the vitamins as for them can pass in the two types of vessels.

Simple: Internal Small Zh-min-nan: Sió-tn̂g

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