Re: Where exactly are the Peyer's Patches...

Here's what it says in Gray's Anatomy:

The Ileum (intestinum ileum) is narrow, its diameter being 3.75 cm., and its coats thinner and less vascular than those of the jejunum. It possesses but few circular folds, and they are small and disappear entirely toward its lower end, but aggregated lymph nodules (Peyer’s patches) are larger and more numerous.

So they're part of the lymphatic system! :)
Tweet