This article is very interesting to help with the visualization of this very important muscle called the Diaphragm. In Osteopathy, the Diaphragm is a key structure to assess; it is also called the main breathing muscle.
The Diaphragm has many anatomical connections with visceras/internal organs: two main blood vessels go through it (vena cava and abdominal aorta), its movement during inhalation and exhalation encourage intestinal transit/bowel movements, helping to drain the body toxins, and it also delimits the boundary between the thoracic cavity and the abdominal cavity. Therefore, the Diaphragm muscle is a key area to check due to its implication in the balance between the thoracic pressure and the abdominal pressure. Any dysfunction affecting this muscle will have consequences on the body function.