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Pseudoaneurysm. A pseudoaneurysm, also known as a false aneurysm, is a locally contained hematoma outside an artery or the heart due to damage to the vessel wall. [1] The injury passes through all three layers of the arterial wall, causing a leak, which is contained by a new, weak "wall" formed by the products of the clotting cascade. [1]
The externa, alternatively known as the tunica adventitia, is composed of collagen fibers and elastic tissue—with the largest arteries containing vasa vasorum, small blood vessels that supply the walls of large blood vessels. [3] Most of the layers have a clear boundary between them, however the tunica externa has a boundary that is ill-defined.
The vascular wall is subdivided into three layers known as the tunica externa, tunica media, and tunica intima. The aorta is covered by an extensive network of tiny blood vessels called vasa vasorum , which feed the tunica externa and tunica media, the outer layers of the aorta. [ 13 ]
The tunica intima (Neo-Latin "inner coat"), or intima for short, is the innermost tunica (layer) of an artery or vein. It is made up of one layer of endothelial cells (and macrophages in areas of disturbed blood flow), [1][2] and is supported by an internal elastic lamina. The endothelial cells are in direct contact with the blood flow.
Tunica media. Transverse section through a small artery and vein of the mucous membrane of the epiglottis of a child. (Tunica media is at 'm'.) The tunica media (Neo-Latin "middle coat"), or media for short, is the middle tunica (layer) of an artery or vein. [1] It lies between the tunica intima on the inside and the tunica externa on the outside.
Arterial dissection of the carotid arteries is a condition that arises when a small tear forms in the innermost lining of the arterial wall, known as the tunica intima. This tear allows blood to enter the space between the inner and outer layers of the vessel, leading to either narrowing or complete occlusion. Notably, the stenosis in the early ...
As a part of the aorta, the entire body, with exception of the respiratory zone of the lung and the heart. The aortic arch, arch of the aorta, or transverse aortic arch (English: / eɪˈɔːrtɪk / [1][2]) is the part of the aorta between the ascending and descending aorta. The arch travels backward, so that it ultimately runs to the left of ...
Aortic dissection (AD) occurs when an injury to the innermost layer of the aorta allows blood to flow between the layers of the aortic wall, forcing the layers apart. [3] In most cases, this is associated with a sudden onset of agonizing chest or back pain , often described as "tearing" in character.