Anatomy books

Wednesday, August 1, 2018

Summary of lesser sac : lecture note


Lesser sac
      It is the part of peritoneal cavity  behind Liver, lesser omentum,  the stomach, & 1st two layers of greater omentum .  


      Parts of lesser sac
      Vestibule
      Three recesses : superior, inferior and left
      One opening  : epiploic foramen
      Body : It has
1.      Two walls: anterior and posterior
2.      Four borders: superior, inferior , right and left 

      Vestibule of lesser sac
      It is a constricted area immediately left of the epiploic foramen situated in between right and left gastropancreatic fold of peritoneum  

      Recesses of lesser sac :
Superior recess is situated just behind the caudate lobe of the liver

Inferior recess :
i
s formed by the junction between two anterior layers of greater omentum with its posterior two layers.

Splenic recess:  is situated in between gastrosplenic and lienorenal ligament

      Body of lesser sac
      Borders of lesser sac
      Right border : epiploic foramen , peritoneal reflexion from the surface of 1st part of duodenum to head of pancreas,Right border of greater omentum 

    

  •  Left border : gastrophrenic ligament , gastrosplenic ligament and left border of greater omentum 
  •  



      
      Inferior border : Is formed by the junction between two anterior layers of greater omentum with its posterior two layers. 
  •   Superior border : Is formed by the peritoneum extending from the caudate lobe of liver to  the diaphragm 

Boundaries of body of lesser sac :
Anterior wall :
        from above downward,
      By the caudate lobe of the liver,
       the lesser omentum,
      back of the stomach
      The anterior two layers of the greater omentum
       


Posterior wall :
From above downward
      The upper end of the left kidney
      The left suprarenal gland
      The upper surface of the pancreas
      The ascending layer of the transverse mesocolon
      The transverse colon
      By the posterior two layers of the greater omentum, 

Clinical anatomy :
      A pancreatic pseudocyst is a circumscribed collection of fluid rich in pancreatic enzymes, blood, and necrotic tissue, typically located in the lesser sac of the abdomen. Pancreatic pseudocysts are usually complications of pancreatitis


      Surgical access of lesser sac
1.      Through lesser omentum
2.      Through Gastrocolic ligament (part of greater omentum )
3.      Through transverse mesocolon


       

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