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The muscle fiber cells are arranged in 5 to 7 layers of circular and longitudinal smooth muscle with about 50μ in length and contain well-marked, rod-shaped nuclei, which are often slightly curved. Separating the tunica media from the outer tunica externa in larger arteries is the external elastic membrane (also called the external elastic ...
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.
The three layers of the vein wall are the outer tunica externa, the middle tunica media and the inner tunica intima. There are also numerous valves present in many of the veins. The outer tunica externa, also known as the tunica adventitia is a sheath of thick connective tissue. This layer is absent in the post-capillary venules. [8]
Venous vasa vasorae, that originate within the vessel wall of the artery but then drain into the main lumen or branches of concomitant vein. [1] Depending on the type of vasa vasorum, it penetrates the vessel wall starting at the intimal layer (vasa vasorum interna) or the adventitial layer (vasa vasorum externa). Due to higher radial and ...
The median cubital vein receives a number of tributaries from the anterior forearm. The median antebrachial vein may or may not drain into the median cubital vein. [3] The median cubital vein issues a branch - the deep median vein - which pierces the fascial roof of the cubital fossa to join the brachial veins. [3]
The middle layer is thicker in the arteries than it is in the veins: [6] The inner layer, tunica intima , is the thinnest layer. It is a single layer of flat cells ( simple squamous epithelium ) glued by a polysaccharide intercellular matrix, surrounded by a thin layer of subendothelial connective tissue interlaced with a number of circularly ...
Deep neurovascular bundles, which often include arteries, have a more complicated structure than superficial neurovascular bundles.Since arteries have high intraluminal blood pressure relative to capillaries and veins, these bundles have smooth muscle and connective tissue structures outside the endothelium.
The median antebrachial vein, also known as median vein of forearm, is a superficial vein of the (anterior) forearm.It arises from - and drains - the superficial palmar venous arch, ascending superficially along the anterior forearm before ending by opening into the median cubital vein near the junction with the basilic vein within the cubital fossa; alternately, it may fork distal to the ...