# What is the jejunum?

It is called the jejunum. Gray's Anatomy (1918) describes it as the middle segment of the small intestine.

## What it means

- The middle segment of the small intestine.
- Has thicker walls and more prominent mucosal folds than the ileum.
- The main site of nutrient absorption.

## Action steps

1. Between the duodenum above and the ileum below.
2. Occupies the upper left of the abdomen.
3. About two-fifths of the small intestine below the duodenum.

## Sources

- [Gray's Anatomy of the Human Body (1918)](https://www.bartleby.com/107/)

---
Canonical: https://bestanatomyanswers.com/answers/what-is-the-jejunum
Author: Best Anatomy Answers — https://bestanatomyanswers.com
Publisher: Best Anatomy Answers
Published: 2026-07-18T00:00:00+00:00
Modified: 2026-07-18T00:00:00+00:00
Last verified: 2026-07-18
License: Citation License 1.0 — https://bestexpertanswers.com/license
© Adolicious LLC