The document provides a comprehensive overview of the jejunum, detailing its gross anatomy, blood and nerve supply, venous and lymphatic drainage. It explains that the jejunum is the second part of the small intestine, approximately 8 feet long, which plays a vital role in nutrient absorption and chemical digestion. Additionally, the jejunum is characterized by its thicker walls and vascularity compared to the ileum, with specific anatomical and vascular relationships described.

1. {
Gross Anatomy of
the Jejunum
including blood and nerve supply, venous and
lymphatic drainage.

2. 1 ‫شديد‬ ‫رفيق‬ ‫بن‬ ‫مصطفى‬ ‫بن‬ ‫عاصم‬ 435032467
2 ‫الدايل‬ ‫عبدالرحمن‬ ‫بن‬ ‫يوسف‬ ‫بن‬ ‫عبدالرحمن‬ 435031641
3 ‫الغامدي‬ ‫لوفه‬ ‫آل‬ ‫عبدهللا‬ ‫بن‬ ‫سعود‬ ‫بن‬ ‫عبدهللا‬ 435031674
4 ‫العتيبي‬ ‫الغبيوي‬ ‫تركي‬ ‫بن‬ ‫بندر‬ ‫بن‬ ‫فراس‬ 435031634
5 ‫الشريف‬ ‫الحامد‬ ‫عبدهللا‬ ‫بن‬ ‫غالب‬ ‫بن‬ ‫فهد‬ 435032389
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8 ‫الحارثي‬ ‫الهميلي‬ ‫عبدهللا‬ ‫بن‬ ‫عيضه‬ ‫بن‬ ‫محمد‬ 435032399
9 ‫الحربي‬ ‫مشعل‬ ‫عبدالرحمن‬ 435031643
Teamwork :

3.  Overview of Jejunum
 Gross Anatomy of the Jejunum .
 Blood Supply .
 Venous Drainage .
 Nerve Supply .
 lymphatic drainage .
 Relations of Jejunum .
 Location of Jejunum .
 MCQ
 In Summary .
Topic objectives:

4. • The jejunum is the second part of the small intestine .
• It is connecting the duodenum to the ileum , it is about 8 ft
(2.4 m).
• The jejunum begins at the duodenojejunal flexure.
Overview of Jejunum

5.  The jejunum lies coiled in
the upper part of the
peritoneal cavity below
the left side of the
transverse mesocolon.
 It is wider bored, thicker
walled, redder and more
vascular than the ileum.
 The jejunal wall feels
thicker because the
permanent infoldings of
the mucous membrane.

6. Gross Anatomy of the Jejunum .
• Macroscopic anatomy :
• The jejunum is the middle of the three
parts of the small intestine.
• The transition from the
extraperitoneal ascending part of the
duodenum to the intraperitoneal
jejunum occurs at the duodenojejunal
flexure (at the height of L2).
• The transition to the ileum is not
sharply marked and only visible
microscopically.
• Like all intraperitoneal organs both
the jejunum and ileum are attached to
the posterior wall of the abdomen by
the mesentery.

7. Jejunum
▪ Most absorption of nutrients occurs here
▪ Chemical digestion occurs here
▪ Long finger shaped villi
▪ Thick walled and wide lumen

8. Blood Supply
• Arteries: The arterial supply is from branches of the superior
mesenteric artery .

9. Venous Drainage of
Jejunum
• Venous drainage of jejunum is by superior mesenteric vein.
• The superior mesenteric vein reach to the point it unites
with the splenic vein and form the Portal vein(hepatic
portal vein).
• The superior mesenteric vein go with (accompanies) the
superior mesenteric artery to it’s right and anterior of the
superior mesenteric vein.

11. Nerve Supply of jejunum
• Nerve Supply of jejunum derived from :
• sympathetic and parasympathetic nerves .
• The sympathetic innervation is carried by
the nerves of superior mesenteric plexus,
the parasympathetic innervation by the
vagus nerve (cranial nerve X).

13. lymphatic drainage
• Lymphatic vessels of the jejunum pass into mesenteric nodes via the
lacteals of the villi.
• They do not reach the superior mesenteric nodes, which the blood
vessels follow.
• All the efferents pass into the intestinal lymph trunks, which then enter
the cisterna chyli or the abdominal confluence of lymph trunks.
• The cisterna chyli drains into the thoracic duct.

14. mesenteric nodes

16. Relations of jejunum
 The jejunum begins at
the duodenojejunal
flexure at the level of
second lumbar
vertebra.
 the duodenojejunal
flexure is located on
left of the aorta.

17. Location of Jejunum
 Most of the jejunum Lies in the upper part of the
abdominal cavity and to the left of the midline.
 The coils of jejunum is attached to the posterior
abdominal wall by a fan-shaped fold of
peritoneum known as the mesentery of the small
intestine.

19. MCQs
1- Venous drainage of jejunum is drawn by :
a- superior mesenteric artery b- inferior mesenteric artery
c- superior mesenteric vein d- inferior mesenteric vein
2- At what level does the jejunum begin :
a .Thoracic XII. b .Lumber III.
. c .Lumber II. d .Sacrum.
3- Lymphatic vessels within the bowel villi, which carry the lipids to the
circulatory system, are known as:
a. vessels. b. ductules.
c. canaliculi. d. lacteals.

20.  The jejunum makes up about it is 8 ft ((2.4 m)).
 The arterial supply is from branches of the
superior mesenteric artery .
 Veins drain into superior mesenteric vein
 The sympathetic innervation is carried by the
nerves of superior mesenteric plexus, the
parasympathetic innervation by the vagus nerve
(cranial nerve X).
 Lymph vessels pass through many intermediate
mesenteric nodes & finally reach superior
mesenteric nodes (situated around origin of
mesenteric artery)
In Summary

21. THANK YOU