Title: Small intestine - human anatomy organs
Headings: 
Small intestine
SMALL INTESTINE ANATOMY
SMALL INTESTINE STRUCTURE
SMALL INTESTINE DIAGRAM
Image: Small Intestine
THE SECTIONS OF THE SMALL INTESTINE
STRUCTURAL MODIFICATIONS OF THE SMALL INTESTINE
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Human anatomy systems:

Content: The superior mesenteric plexus is responsible for innervating the small intestine. Sensory fibers along with postganglionic sympathetic fibers and preganglionic parasympathetic fibers reach the small intestine through these various branches. Branches of the celiac trunk and inferior mesenteric artery along with a direct line from the superior mesenteric artery are responsible for providing the small intestine with ample blood supply. The superior mesenteric vein provides the appropriate venous drainage, which then creates a unified vein with the splenic vein to create the hepatic portal vein. The hepatic portal vein then travels to the liver, where the nutrient laden blood supply can be utilized by the body. SMALL INTESTINE DIAGRAM
Image: Small Intestine
THE SECTIONS OF THE SMALL INTESTINE
The small intestine is segregated into three basic regions, based entirely on functional and structural bias. The first ten inches from the pyloric sphincter of the stomach is known as the duodenum. It remains in the basic shape of a C, and is considered to be in a fixed position. The duodenum is retroperitoneal, with a small exception of the first few inches in the beginning that draw from the stomach.