Thoracic aortic dissections are further characterized with the Stanford classification. These mice died suddenly due to thoracic aortic dissections. Herophilos was the first scientist to systematically perform scientific dissections of human cadavers. Complicated Stanford type B aortic dissections require surgical intervention after initiation of medical therapy. He was the first scientist to systematically perform scientific dissections of human cadavers. Type A dissections involve the root and ascending aorta. Patients with severe bleeding after car accidents, explosions, gunshot wounds or aortic dissections, etc. Through his work with animal dissections and evolutionary biology, Aristotle founded comparative anatomy. Several different classification systems have been used to describe aortic dissections. In uncomplicated aortic dissections, no benefit has been demonstrated over medical management alone. In about 13% of aortic dissections, no evidence of an intimal tear is found. With aggressive treatment, 30-day survival for thoracic dissections may be as high as 90%. Peripheral Arterial Dissections can be found elsewhere in the arms and legs. The demonstrations were structured into dissections and lectures. Herophilos in his dissections discovered the differences between nerves and blood vessels.