These important functions are carried out by the costal diaphragm—a radial array of myofibers, surrounded by muscle connective tissue, that extend from the ribs to the central tendon .

The diaphragm is the dome-shaped structure that separates the thoracic and abdominal cavities. ... this technique primarily images the central tendon of the diaphragm, ...

In some cases the central tendon of the diaphragm appears broader and thinner than normal. 18,50 In others there are muscle fibers in only one segment 19,51 or scattered irregularly throughout the ...