Q. True Vs false diverticulum?

[sgsh]

Q. We know, GI tract consists of 4 layers-mucosa, submucosa, muscularis externa and serosa (from inside to outside).We know, in true diverticulum, 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 thebowelwall which aremucosa,submucosaandmuscularis 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???

Again in other site ( http://radiopaedia.org/articles/diverticulum) it's mentioned that all layers of bowel wall-mucosa, muscular layer and serosa , are involved to form outpouching. Then, what about submucosa here ????

Next, in false 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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[sgsh]

Hey guys! waiting for your answers, pls help.

 

[Transposony]

Serosa is the visceral peritoneum covering the intestine. When the three layers protrude serosa is still covering it (being the outermost layer). It's just like trying to poke your finger through a piece of cloth. The cloth covering your finger protrudes along with your finger but it doesn't go through your finger.
Also true diverticulum can still happen where the intestine does not have a serosal covering (retroperitoneal i.e. posterior ascending/descending colon etc).

You are right that "false" diverticula is the outpuoching of mucosa and submucosa. IOW false diverticulum lacks muscularis externa.
Remember, the false diverticulum will also be covered by the visceral peritoneum (serosa) whereever serosa is present.

Hope this helps.

 

[sgsh]

Thanks Transposony. Your explanation helped a lot.It makes sense too.