APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The small intestine has three parts: the duodenum, jejunum, and ileum. It helps to further digest food coming from the stomach. It absorbs nutrients (vitamins, minerals, carbohydrates, fats, proteins) and water from food so they can be used by the body.

Detailed explanation-2: -Jejunum. After chemical digestion in the duodenum, food moves into the jejunum, where the muscle work of digestion picks up. Nerves in the intestinal walls trigger its muscles to churn food back and forth (segmentation), mixing it with digestive juices.

Detailed explanation-3: -The duodenum is the first part of the small intestine (5-7 m), followed by the jejunum and ileum (in that order); it is also the widest and shortest (25 cm) part of the small intestine.

Detailed explanation-4: -Etymology. Jejunum is derived from the Latin word jējūnus, meaning “fasting.” It was so called because this part of the small intestine was frequently found to be void of food following death, due to its intensive peristaltic activity relative to the duodenum and ileum.

Detailed explanation-5: -The small intestine (small bowel) lies between the stomach and the large intestine (large bowel) and includes the duodenum, jejunum, and ileum.