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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

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Small intestine & Superior Mesenteric Artery Dr. Nimir , Dr. Safaa

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  1. Small intestine & Superior Mesenteric ArteryDr. Nimir, Dr. Safaa

  2. 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

  3. 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

  4. Definition • The mesentery is a fan-shaped fold of peritoneum that attaches the jejunum and ileum to the posterior abdominal wall

  5. 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 .

  6. The root of the mesentery crosses : • the ascending and horizontal parts of the duodenum • abdominal aorta • IVC • right ureter • right psoas major • right testicular or ovarian vessels.

  7. Contents • Superior mesenteric vessels, • The lymph nodes draining the small gut • Autonomic nerve fibres. • A variable amount of fat

  8. Jejunum and Ileum

  9. 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 artery • Right colic artery • Middle colic artery • 12-15 jujenal and ileal branches

  10. 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

  11. Venous Drainage Portal circulation

  12. Lymph Drainage • Lymph from viscera supplied by the thesuperior mesenteric artery drain into the superior mesenteric nodes Mesenteric nodes ( Regional Nodes) ↓ Superior mesenteric nodes Celiac n.  cisterna chyli Thoracic Duct

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