Mesentery

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Mesentery

  1. 1. ARYAMILYAS
  2. 2. What isMesentery?ClinicalsWhat isPeritoneum?FunctionalImportance ofMesenteryFormation ofMesenteryHistologicalAppearanceof Mesentery
  3. 3. Lovely, isn’t it?
  4. 4. Histological Appearance
  5. 5. THE MESENTERY IS THE FAN-SHAPED DOUBLE LAYER OFPERITONEUM THAT SUSPENDSTHE JEJUNUM AND ILEUM FROMTHE POSTERIOR WALL OF THEABDOMEN
  6. 6. THE PERITONEUM IS THIN SEROUS MEMBRANETHAT LINES THE ABDOMINAL AND PELVICCAVITIES, AND COVERS MOST ABDOMINALVISCERA. IT IS COMPOSED OF LAYER OFMESOTHELIUM SUPPORTED BY A THIN LAYEROF CONNECTIVE TISSUE.Peritoneum
  7. 7. --BETWEEN THE TWO SHEETSOF PERITONEUM ARE BLOODVESSELS, LYMPH VESSELS, ANDNERVES--LARGEST SEROUS MEMBRANEIN THE BODY
  8. 8. The Peritoneum develops ultimately fromthe mesoderm of the trilaminar embryo.Embryological Development ofPeritoneum
  9. 9. etymology Greek: Peri- around, -ton- stretching. peritoneum means stretched around orstretched over. The suffix -enteries is Greek word (enteron),meaning gut or entrails or intestines
  10. 10. PERITONEUM ASSOCIATEDWITH THE INTESTINES ISTERMED AS MESENTERY.
  11. 11. INTESTINES: HEMMESENTERY: DRAPES
  12. 12. FORMATION OFMESENTERY
  13. 13. PARIETAL PERITONEUMVISCERAL PERITONEUM
  14. 14. If this organ is invaginated far enough into theperitoneum, the visceral peritoneum will come in contact withitself,forming the organs mesentery.Visceral peritoneum will often surround all but apart of the organ ("bare area")through which the organ transmits blood vessels andnervesThe Peritoneum invaginates at certain parts,with an organ inside the invagination.
  15. 15. Relating Structures "intraperitoneal" (e.g. the stomach) "retroperitoneal" (e.g. the kidneys) "subperitoneal" or "infraperitoneal"(e.g. the bladder).
  16. 16. The mesentery comes from the embryologicstructure the dorsal mesentery. The embryoalso has a portion of tissue called the ventralmesentery, but this usually becomes part of theliver.Embryological Development ofMesentery
  17. 17. Mesenteries in our body:Mesentery (proper)MesocolonMeso-appendixTransverse mesocolonSigmoid mesocolonMesovariumMesometriumMesosalpinx
  18. 18. Histologically,Mesentery isLoose Areolar ConnectiveTissueCellsFibersGround Substance
  19. 19. Collagen type I fibers are thick and stain a darker red hue, while elastic fibers are thin and form blackcrisscrosses across the tissue. The nuclei can be seen as a distinct purple hue, as well as erythrocyteclumps that are embedded within the mesh-work of fibers. The cells are widely disperse in theextracellular matrix, made up of ground substance and the fibers, which comprises most of the tissue.Most of the cells found here are fibroblasts, which produce the fibers in the extracellular matrix.
  20. 20. Job Keeping the guts in place Limiting gut movement protection from injury Conduit
  21. 21. --BLOOD VESSELS--LYMPH VESSELS N NODES--NERVES
  22. 22. CLINICALSMesentery of a mouse
  23. 23. Mesenteric lymphadenitis A.k.a. Mesenteric adenitis: inflammation of thelymph nodes in mesentery usually results from an intestinal infection. occurs mainly in children and teens often mimics the signs and symptoms ofappendicitis. Unlike appendicitis, however, mesentericlymphadenitis is seldom serious and clears onits own.
  24. 24. •Inadequate blood flow to the mesentery•Can lead to mesenteric infarction•More common in the elderly•Severe abdominal pain and the presenceof blood in the stool.Causes:Sudden drop In blood pressure,Atherosclerosis, Embolus formationMesenteric Ischemia
  25. 25. Arterial supply ofMesenteryMesenteric Ischemia
  26. 26. IN CORPULENT PERSONS THEMESENTERY, LIKE THE GREATEROMENTUM, CONTAINS ANADDITIONAL QUANTITY OF FAT.THIS INCREASED WEIGHTTENDS TO ELONGATE THEMESENTERY BY DRAGGING, ANDTHEREFORE PREDISPOSES TOHERNIA.
  27. 27. Pakoray or…….?
  28. 28. "I LIKENONSENSE, ITWAKES UP THEBRAIN CELLS."---DR. SEUSS

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