Ileum: Anatomy and Function

The ileum is the final section of the small intestine, located between the jejunum and the cecum, which is the first part of the large intestine. It is approximately 2-4 meters in length and is responsible for the absorption of nutrients from the digested food.

Anatomy of the Ileum

The ileum is characterized by its thin walls and numerous small finger-like projections called villi, which increase the surface area for nutrient absorption. It is also rich in blood vessels and lymphatic vessels to facilitate the transport of absorbed nutrients.

Function of the Ileum

The primary function of the ileum is the absorption of vitamin B12, bile salts, and any nutrients that were not absorbed by the jejunum. It also plays a role in the reabsorption of water and electrolytes before the remaining undigested food moves into the large intestine.

Study Guide

Here are some key points to remember about the ileum:

• The ileum is the final section of the small intestine, located between the jejunum and the cecum.
• It is responsible for the absorption of nutrients from the digested food.
• The ileum has thin walls and villi to increase the surface area for absorption.
• It absorbs vitamin B12, bile salts, and any remaining nutrients from the digested food.
• The ileum also plays a role in the reabsorption of water and electrolytes.

Remember to review the anatomy and function of the ileum to have a clear understanding of its role in the digestive system.