Why ascending part of colon lacks mesentery?

Dear student,                     
​Please find below the solution to the asked query  
   

​Ascending colon is a retroperitoneal organ i.e. it has peritoneum on its anterior side only. Since, it has peritoneum on its inner side, it does not require mesentery which is a peritoneal part present outside of an organ helping it for attachment to some other structure or organ.
Hope this information will clear your doubts about the topic.   
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