Anatomy, Abdomen and Pelvis, Small Intestine

Excerpt

The small intestine is a crucial gastrointestinal segment involved in nutrient digestion and absorption, various endocrine functions, and immune protection (see Image. Small Intestine). A complex network of blood vessels, nerves, muscles, and special cells work together to enable the small intestine to achieve these tasks. This digestive tube has an average length of 3 to 5 meters, extending between the gastric pylorus and ileocecal junction. The duodenum, jejunum, and ileum are the 3 components comprising the small intestine.

Small bowel pathology can lead to concerning symptoms, such as severe abdominal pain, gastrointestinal bleeding, enterocutaneous fistulae, and various nutrient deficiency manifestations. Understanding the anatomy and pathology of this digestive segment is crucial for providers diagnosing and treating gastrointestinal conditions.