Ileal veins

Anatomy and function of the ileal veins

Ileal veins

Diagram of the ileal veins and their connections.

The ileal veins are a group of veins that drain blood from the ileum, which is the final section of the small intestine. These veins are part of the mesenteric circulation and play a crucial role in transporting nutrient-rich blood from the digestive tract to the portal vein and ultimately to the liver.

Anatomy

The ileal veins are tributaries of the superior mesenteric vein, which is a major vein in the abdomen that drains blood from the small intestine, cecum, and parts of the colon. The ileal veins run parallel to the ileal arteries, which supply arterial blood to the ileum.

Location

The ileal veins are located in the mesentery, a fold of tissue that attaches the intestines to the posterior abdominal wall. They are situated alongside the ileal arteries and lymphatic vessels, forming a network that supports the ileum.

Structure

The ileal veins are thin-walled vessels that collect deoxygenated blood from the capillaries of the ileum. They converge to form larger veins that eventually drain into the superior mesenteric vein. The superior mesenteric vein then joins with the splenic vein to form the portal vein, which carries blood to the liver for detoxification and nutrient processing.

Function

The primary function of the ileal veins is to transport blood that has absorbed nutrients from the ileum to the liver. This blood contains digested nutrients such as amino acids, simple sugars, and fatty acids, which are processed by the liver before being released into the systemic circulation.

Clinical significance

The ileal veins, like other veins in the mesenteric circulation, can be involved in various medical conditions. For example, thrombosis of the mesenteric veins can lead to mesenteric ischemia, a serious condition that results in reduced blood flow to the intestines. Additionally, conditions such as portal hypertension can affect the flow of blood through the portal vein system, impacting the ileal veins.

Related pages

• Ileum
• Superior mesenteric vein
• Portal vein
• Mesenteric circulation
• Small intestine