![]() ![]() The diaphragm is innervated by the phrenic nerve which ensures that it functions properly. The peripheral part of the diaphragm consists of muscular fibers that take origin from the circumference of the inferior thoracic aperture and converge to insert into a central tendon. Hence, its convex upper surface forms the floor of the thoracic cavity and the concave lower surface forms the roof of the abdominal cavity. ![]() The diaphragm is a dome-shaped musculo-fibrous septum that separates the thoracic cavity from the rest of the abdominal cavity. Before we go on to discussing the diaphragm function, let us take a look at its anatomy. However, when one says the diaphragm, then the reference is usually to the thoracic diaphragm. These include the urogenital diaphragm, pelvic diaphragm and the diaphragms present in the eardrum and the iris of the eye. There are other diaphragms in the body as well. ![]() When we say ‘diaphragm’, we generally refer to the thoracic diaphragm that helps in breathing. This is an important muscle that separates the thoracic cavity, which contains the heart, lungs and ribs, from the abdominal cavity. The diaphragm is a sheet of internal muscle which extends across the bottom of the rib cage. ![]()
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