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anatomy

The diaphragm is a major muscle of ventilation and consists of a musculotendinous sheet separating the thorax and abdomen. Based on the origin of its muscle fibers, the diaphragm is divided into anterior or sternocostal part and a posterior or lumbar part, which may be functionally different. The muscle fibers from all parts insert into the boomerang-shaped central tendon. Three major openings in the normal diaphragm allow passage of the aorta, esophagus, inferior vena cava, and accompanying nerves and vascular and lymphatic channels. In addition to these normal openings, there are two symmetric "week areas" known as the foramina of Morgagni and Bochdalek. The former is located anteriorly and the latter posterolaterally. They are sometimes the sites of diaphragmatic hernia.

 

ANATOMY OF THE NORMAL DIAPHRAGM VIEWED FROM BELOW