Jejunal veins

Jejunal veins are veins that drain oxygen-depleted blood from the jejunum, a part of the small intestine. They are counterparts to the jejunal arteries, which supply oxygen-rich blood to the jejunum. The jejunal veins are part of the portal venous system, which carries blood from the gastrointestinal tract and spleen to the liver.

Etymology

The term "jejunal" is derived from the Latin word "jejunus", which means "fasting" or "empty". This is because the jejunum was often found to be empty in cadavers.

Anatomy

The jejunal veins begin in the villi of the jejunum, where they collect oxygen-depleted blood. They then merge to form larger veins, which eventually join to form the superior mesenteric vein. The superior mesenteric vein is one of the major veins of the portal venous system.

Function

The main function of the jejunal veins is to carry oxygen-depleted blood from the jejunum to the liver. This blood is rich in nutrients absorbed from food in the small intestine. In the liver, these nutrients are processed and detoxified before being released into the general circulation.

Clinical significance

Abnormalities or diseases of the jejunal veins can lead to serious health problems. For example, portal hypertension can cause the veins to become enlarged and varicose, leading to esophageal varices and gastrointestinal bleeding. In addition, thrombosis in the jejunal veins can cause mesenteric ischemia, a serious condition that requires immediate medical attention.

See also

• Portal vein
• Superior mesenteric vein
• Jejunum
• Small intestine

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