Typically, muscle fibers of the diaphragm originate radially, from the margins of the inferior thoracic aperture, and converge into a large central tendon.

Due to the oblique angle of the inferior thoracic aperture, the posterior connection of the diaphragm is inferior to the anterior connection.

The diaphragm isn’t fiat; instead, it “balloons” superiorly, on both the left and right sides, to create domes. The right dome is higher in relation to the left, reaching as far as rib V.

As the diaphragm contracts, the height of the domes falls and the amount of the thorax raises.

The esophagus and inferior vena cava enter the diaphragm; the aorta enters posterior to the diaphragm.