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Telangiectasias (from tel- 'end' angi- 'blood vessel' and ectasia 'the expansion of a hollow or tubular organ'), also known as spider veins, are small dilated blood vessels [1] that can occur near the surface of the skin or mucous membranes, measuring between 0.5 and 1 millimeter in diameter. [2]
[33] All veins which are between the skin and the superficial fascia are tributaries, and all veins which cross the deep fascia to join the deep venous system are perforator veins. [34] Three anatomic compartments can be described, as networks: N1 contains the deep veins, also known as the deep compartment.
Aside from the potentially deadly process of embolization, a clot can resolve through organization, which can damage the valves of veins, cause vein fibrosis, and result in non-compliant veins. [ 106 ] [ 107 ] Organization of a thrombus into the vein can occur at the third stage of its pathological development, in which collagen becomes the ...
Cutaneous small-vessel vasculitis (CSVV) is inflammation of small blood vessels, usually accompanied by small lumps beneath the skin. [1]: 831 [2] The condition is also known as hypersensitivity vasculitis, cutaneous leukocytoclastic vasculitis, hypersensitivity angiitis, cutaneous leukocytoclastic angiitis, cutaneous necrotizing vasculitis and cutaneous necrotizing venulitis, [3]
Human blood in veins is not actually blue. Blood is red due to the presence of hemoglobin; deoxygenated blood (in veins) has a deep red color, and oxygenated blood (in arteries) has a light cherry-red color. Veins below the skin can appear blue or green due to subsurface scattering of light through the skin, and aspects of human color ...
There are three sizes of veins: large, medium, and small. Smaller veins are called venules, and the smallest the post-capillary venules are microscopic that make up the veins of the microcirculation. [2] Veins are often closer to the skin than arteries. Veins have less smooth muscle and connective tissue and wider internal diameters than ...
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A list of veins in the human body: Veins of the heart. Coronary sinus. Great cardiac vein; Oblique vein of left atrium; Middle cardiac vein; Small cardiac vein