You may be under the impression that there were other first of the month posts before this one, but you’d be wrong! …Sort of.  This is the first of the “1st of the Month” posts, which will be something other than the ordinary comic and will depict something extra nifty.

Referred pain regions means that the pain caused by the specific organ will be felt in the areas depicted.  Not all of it is very intuitive either, especially for those without much anatomy/medical knowledge.

The image of the thumbs up dude is brought to you by Mike Gruhn.