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The gastrointestinal tract is a long tube, with significant associated glands, and its function is the transformation of the complex molecules of food into simpler substances and readily usable by the body. Simple nutritious
These compounds are absorbed by the intestinal villi lining the small intestine. So, enter the blood and nourish every cell in the body.
From the mouth to the anus, the digestive tract is about eleven meters in length. The gastrointestinal tract continues through the large intestine, from just over five feet in length. His final portion is the rectum, which ends at the anus, where are evacuated outside the indigestible remains of food.

Histological structure of the tube
digestive tract and accessory glands (salivary glands, liver and pancreas), form the digestive tract. However the pancreas by an endocrine gland also be addressed on that page. (Endocrine glands).
Histologically consists of four concentric layers that are inside out:
inner layer or mucosa (which can be found mucus-secreting glands and HCl lymphatic vessels and some lymph nodes and lamina propria). Includes an inner muscular layer or muscularis mucosae
submucosa layer composed of loose connective tissue. Submucosa layer contains the so-called Meissner's submucosal plexus, which is a component of the enteric nervous system.
muscular layer consisting of a layer of smooth muscle (except in the esophagus, where striated muscle).
Inside is another component of the enteric nervous system, myenteric plexus of Auerbach
Serosa or adventitia layer . Is named after the region of the gut lining, as if intraperitoneal serosa or adventitia if retroperitoneal. The adventitia consists of loose connective tissue.
submucosal and myenteric plexuses constitute the enteric nervous system that is distributed throughout the gastrointestinal tract from the esophagus to the anus. Below the diaphragm, there is a fourth layer called the serosa, formed by the peritoneum.
The wall thickness varies by anatomical site, as well as the surface can be smooth or not.
The epithelium may occur is a plane or a multilevel cornified no simple prismatic microvilli.
In the crypts of the mucous glands flowing.
These can be of the mucosa or submucosa. Meanwhile, a villus is the constant upheaval of the mucosa.
If the fold is accompanied by the submucosa, then the folding of the submucosa.
The fold is called the submucosa valve Kerckring conniving or fold.
conniving valve can maintain the presence of villi.