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The diaphragm becomes dome shaped as it is pushed cranially into the pleural cavities by the expanding liver. It is attached at its periphery to the sternum, lower costal cartilages and vertebral column. Its attachment to the vertebral column is accomplished by way of two vertical muscular bands called right and left crura. Primordial muscle cells make up the diaphragm except in the area between the heart and liver called the central tendon.

Source: Atlas of Human Embryos.