Which tunic of an artery contains endothelium

Which tunic of an artery contains endothelium

Statics 17 march 2020

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The tunica intima (New Latin for “inner coat”), or intima for short, is the artery or vein’s innermost tunica (layer). It is protected by an internal elastic lamina and is made up of one layer of endothelial cells. The blood supply is in close contact with the endothelial cells.
The inner coat (tunica intima) can be separated from the middle coat (tunica media) by a little maceration or by stripping it off in small pieces during dissection; however, due to its friability, it cannot be separated as a full membrane. It’s a fine, clear, colorless structure that’s highly elastic and gets corrugated into longitudinal wrinkles after death.
Systemic circulatory system
Aorta Arteries Arterioles Capillaries Venules Veins Vena cava (Right heart)Pulmonary Arteries Lungs Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmonary Veins Pulmon (Left heart)
Microanatomy is the study of microscopic organisms.

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The vascular system has a common histological organization, which is particularly visible at the level of the large vessels. The tissue components that make up the vascular walls (endothelium, smooth muscle, elastic elements, and connective tissue) are organized in concentric layers. This layered structure has undergone segmental differentiations that characterize each type of vessel under the influence of local functional factors. The concentric layers have been categorized into three tunics for descriptive purposes (from the lumen outward):
Wide veins arising from the heart ventricles, such as the aorta and pulmonary artery, are examples of elastic arteries. The three layers of the aorta wall are depicted on this slide. The tunica intima is made up of endothelial cells and the supporting tissue beneath them. The tunica media, which is made up of elastic fibers, smooth muscle, and collagenous tissue, is the largest part of the wall. The presence of a large number of elastic fibers should be noted. Elastic fibers in the media allow for the control of blood pressure by allowing the vessel walls to expand and contract. Finally, the tunica adventitia is the arterial wall’s outermost part. It mainly consists of connective tissue with a few small blood vessels called vasa vasorum that protect the arterial wall’s cells.

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The channels or conduits by which blood is distributed to body tissues are known as blood vessels. Two closed networks of tubes begin and end at the heart make up the vessels. Blood is transferred from the right ventricle to the lungs and back to the left atrium through the pulmonary arteries. The systemic vessels, on the other hand, transport blood from the left ventricle to all areas of the body’s tissues before returning it to the right atrium. Blood vessels are known as arteries, capillaries, or veins based on their form and function.
Blood is carried away from the heart by arteries. The pulmonary arteries carry oxygen-depleted blood from the right ventricle to the lungs. The left ventricle sends oxygenated blood to the body tissues through systemic arteries. Blood is pumped from the ventricles through large elastic arteries, which branch into smaller and smaller arteries before microscopic arteries known as arterioles are formed. The arterioles are responsible for controlling blood flow into tissue capillaries. At any given time, about 10% of total blood volume is in the systemic arterial system.