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

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
6 ‫المطيري‬ ‫الصيعري‬ ‫عائض‬ ‫بن‬ ‫عيد‬ ‫بن‬ ‫فيصل‬ 435031637
7 ‫الحربي‬ ‫أحمد‬ ‫بن‬ ‫موسى‬ ‫بن‬ ‫متعب‬ 435032375
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