You may also have diarrhea or a fever. It is sometimes called stomach flu, but it is not the flu. Germs like viruses and bacteria can cause it. You can catch it from someone else who has it, or you can get it from food poisoning. Food poisoning can happen if you eat foods that contain harmful germs.
The circular muscle located at the entrance and exit to the stomach is called the sphincter. So for this question, you are talking about two distinct sphincters. This anatomical structure is able to open, and contract or close as needed.
The internal abdominal oblique muscle (m. obliquus internus abdominis) is located under the external oblique muscle in the anterolateral division of the abdominal wall, that is, forms the second layer of muscles lateral abdominal wall.he muscle is broad and flat, part of the abdomen. Start point is on the outer surface of the lower eight ribs. Pencils are sent to the oblique muscles down and in front (to the anterior abdominal wall), turn into aponeurosis.