Muscle of right hemidiaphragm

The muscular fibers of the right part of diaphragm (right hemidiaphragm) may be grouped according to their origins into three parts:

• The lumbar part arises from aponeurotic arches, the right medial arcuate ligament and the right lateral arcuate ligament (also termed lumbocostal arches), and from the lumbar vertebrae by the right crus of diaphragm.

• The costal part arises from the inner surfaces of the cartilages and adjacent portions of the lower six ribs on either side, interdigitating with the Transversus abdominis

• The sternal part arises by two fleshy slips from the back of the xiphoid process