Development Of Urinary Bladder &Urethra Dr. Nimir Dr. Safaa.
Small intestine & Superior Mesenteric Artery Dr. Nimir , Dr. Safaa
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Transcript of Small intestine & Superior Mesenteric Artery Dr. Nimir , Dr. Safaa
Small intestine & Superior Mesenteric Artery
Dr. Nimir, Dr. Safaa
Objectives• Length of jejunum and ileum• Definition of the mesentary• Define the root of the mesentary its length and
extent.• Contents of the mesentary.• Distinction between jejunum and ileum(List the differences between jejunum and ileum)• Superior mesenteric artery and vein• Lymphatic drainage of the jejunum and ileum
Jejunum and Ileum• The jejunum represents the proximal
two-fifths.• It begins at the duodenojejunal flexure.• The ileum represents the distal three-
fifths. It ends at the ileocecal junction.• Together, the jejunum and ileum are 6
to7 m long
Definition• The mesentery is a fan-shaped fold
of peritoneum that attaches the jejunum and ileum to the posterior abdominal wall
The root (origin) of the mesentery The root (origin) of the mesentery is
approximately 15 cm long.It is directed obliquely, inferiorly, and to the right . It extends: from the duodenojejunal junction on the
left side of vertebra L2 to the ileocolic junction .
The root of the mesentery crosses : the ascending and horizontal parts of
the duodenum abdominal aorta IVCright ureter right psoas majorright testicular or ovarian vessels.
Contents Superior mesenteric vessels, The lymph nodes draining the small
gut Autonomic nerve fibres. A variable amount of fat
Jejunum and Ileum
SUPERIOR MESENTERIC ARTERY:- The superior mesenteric artery arises
from the anterior surface of the abdominal aorta approximately 1 cm inferior to the celiac trunk at level L1.
Branches:-Ileocolic arteryRight colic arteryMiddle colic artery12-15 jujenal and ileal branches
• The superior mesenteric vein• The superior mesenteric vein drains
the jejunum and ileum .• It lies anterior and to the right of the
SMA in the root of the root the mesentary .• The SMV ends posterior to the neck of
the pancreas, where it unites with the splenic vein to form the portal vein
Venous DrainagePortal circulation
Lymph Drainage• Lymph from viscera supplied by the the
superior mesenteric artery drain into the superior mesenteric nodes
Mesenteric nodes ( Regional Nodes) ↓ Superior mesenteric nodes Celiac n. cisterna chyli Thoracic Duct