Equine colic is something every horse owner can relate to, especially this winter with all the wild temperature swings.
Google credible hits like vets or .edu sites.
I've looked and there diagrams showing the insides of a horse as they pertain to the stomach and colic.
That should be good for about ten minutes max, if you don't use a bunch of flowery adjectives and adverbs.
The diagrams will help everyone else better understand colic and why they need to do their best to avoid it in their horse(s)