It's too late for me but stretch marks are perfectly preventable (sometimes, though, whatever you do you still get them) so here are some tips I give to my friends: Maintain a healthy skin. Drink lots of water (at least 2 litres every day) - not soda or juices - because it helps your skin stay elastic.
Last edited: June 27, 2015. The mediastinum is the central compartment of the thoracic cavity, located between the two pleural sacs. It contains most of the thoracic organs, and acts as a conduit for structures traversing the thorax on their way into the abdomen.
Updated August 07, 2016. The mediastinum is the area in the chest between the lungs, that contains the heart, part of the windpipe (the trachea), the esophagus, and the great vessels including the ascending aorta and right and left pulmonary arteries -- essentially all of the organs in the chest except the lungs.