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Old 10-10-2015
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Save It! Q. true vs false diverticulum?

Q. We know, GI tract consists of 4 layers-mucosa, submucosa, muscularis externa and serosa (from inside to outside).We also know that in true diverticulum (Eg. Meckel's divertilum), all layers of GI tract are involved,This means all 4 layers should be involved,right? .But, in wikipedia ,it's mentioned that" true diverticulum consist of all 3 layers of the bowel wall which are mucosa, submucosa and muscularis propria" . Then what about serosa??? , "why here it is called " all 3 layers" (In pathoma too it's mentioned "all 3 layers"), WHY NOT all 4 layers??? In contrast to this, in other site (http://radiopaedia.org/articles/diverticulum) it's mentioned that all layers of bowel wall-mucosa, muscular layer and seros are involved to form outpouching. Then, what about submucosa here ????

Next, in false diverticulum (eg. Zenker diverticulum), in the same above mentioned site, it's mentioned that "mucosa is pushed though defect in muscular layer" and this is consistent with the defination given in pathoma as well. Then, I am curious to know, what happens to submucosa ??? Submucosa is in between mucosa and muscular layer. How is it possible that only mucosa is pushed into muscular wall without involvement of submucosa???
Can anyone pls help to clear this confusion. It's really troubling.Thanks.
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Old 10-11-2015
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Because serosa is not always present
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Aumsai (10-12-2015)
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Old 10-12-2015
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Thanks datson.That might be one reason but that doesn't clarify all what I have mentioned.Anybody with any more explanations???
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Old 10-12-2015
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Ok, this is just a conjecture, but I would say that - for the three/four layer thing, they just don't take serosa into account. Of course it's gonna be there, if it's supposed to be there (like in Meckel's). But it's a very thin layer and in the whole true/false diverticulum concept relatively unimportant.
About submucosa for false diverticulum - submucosa is very loose tissue. I would say that in the formation of false diverticulum, mucosa gets sort of pushed through muscularis propria and submucosa due to its consistency moves aside.
Again, that is just my understanding of the topic. I am not sure if it's right.
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Old 10-14-2015
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Thanks quacky.m for your logical explanation.
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