Aneurysm

An arterial wall weakened by atherosclerosis, malformation, injury, or other causes may balloon out, forming an aneurysm. If an aneurysm ruptures, hemorrhage results. Rupture of a cerebral artery is another cause of stroke. The abdominal aorta and carotid arteries are also common sites of aneurysm. In a dissecting aneurysm (Fig. 9-9), blood hemorrhages into the thick middle layer of the artery wall, separating the muscle as it spreads and sometimes rupturing the vessel. The aorta is most commonly involved. It may be possible to repair a dissecting aneurysm surgically with a graft.

Dissecting Aortic Aneurysm

FIGURE 9-9. Dissecting aortic aneurysm.

Blood entering wall of artery

Aorta

Direction of normal blood flow

Blood entering wall of artery

Blood in artery

FIGURE 9-9. Dissecting aortic aneurysm.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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