Portal:Medicine/Did you know/9

• ...Peyer's patches are an example of gut-associated lymphoid tissue?

• ...the brain itself is not sensitive to pain, because it lacks pain-sensitive nerve fibers? Several areas of the head can hurt, including a network of nerves which extends over the scalp and certain nerves in the face, mouth, and throat.
• ...that irritable bowel syndrome (IBS) may sometimes have an acute onset and develop after an infectious illness, and that this "Post infectious IBS" (IBS-PI) is drawing much clinical investigation?