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What is its role? The muscle of this layer is smooth muscle that is fitted with alpha and beta adrenergic receptors. Tunica media has elastin, collagen, and smooth muscle fibers. The tunica media, the thickest layer, is composed of spiral smooth muscle cells held together by elastic fibers and an encircling elastic lamina. This layer is thicker in arteries than in veins. The carotid sinus has a relatively thin tunica media and an abundance of glossopharyngeal nerve fibers in the tunica externa. Tunica externa contains collagen, elastin and vasa vasorum. The aim of our study was to compare the wall layers beyond tunica media in arteries of different type and location. Petra Kochova. The tunica media may (especially in arteries) be rich in vascular smooth muscle, which controls the caliber of the vessel. e. None of the above. The thickest wall layer of the aorta is the tunica media, which contributes considerably to the mechanical proper-ties of the vessel wall. Tunica Intima - the inner layer of arteries and veins. Tunica Media - the middle layer of the walls of arteries and veins. Surrounding the tunica intima is the tunica media, comprised of smooth muscle cells and elastic and connective tissues arranged circularly around the vessel. are formed of the tunica media. Medical Information Search. Generally, arteries will typically have a thicker tunica media and smaller lumen; whereas veins will have a larger lumen and the thickest layer is the tunica adventitia. Synonyms for tunica media in Free Thesaurus. Small artery Arteries and veins of similar caliber often travel together. Original magnification: a through h, j, and k, ×100; i and l, ×250. Examine the slide with your scanning objective. General information a. taken together veins form an important blood reservoir, normally have 4-5 It is composed of connective tissue as well as collagen and elastic fibers. You can see the three layers for an artery in Figure \(\PageIndex{7}\). The tunica externa practically disappears and the smooth muscles of the tunica media become fewer and more scattered. It consists of connective tissue with vasa and nervi vasorum and plays a key role in vascular health. It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins. An Artery is composed of 3 Tunics or Layers, this image shows the innermost Tunica Interna (Intima), the middle and largest layer the Tunica Media, but not the outermost layer the Tunica Externa (Adventitia). The tunica media, which in an artery is composed of muscle and elastic fibres, is thinner in a vein and contains less muscle and elastic tissue, and proportionately more collagen fibres (collagen, a fibrous protein, is the main supporting element in connective tissue). The outer layer (tunica adventitia) consists chiefly... Frequent questions. Smooth muscle cells are the cellular source of this extracellular matrix. Vasoconstriction and vasodilation is controlled by the autonomic nervous system and hormones but also by local factors. It lies between the tunica intima on the inside and the tunica externa on the outside. Learn More. Download as PDF. The media, for short, is made of between five to seven layers of smooth muscle, surrounding the lumen of the aorta, and elastic tissue. More developed. Tunica intima means “inner coat” or inner layer, which comes in direct contact with the blood as it flows. Robert Cimrman. However, capillaries are made up of a single layer of endothelial cells. From Wikipedia, the free encyclopedia The tunica media (New Latin "middle coat"), or media for short, is the middle tunica (layer) of an artery or vein. It lies between the tunica intima on the inside and the tunica externa on the outside. Fig. The tunica media is the middle layer of a blood vessel. They are more active in vasoconstriction and do not expand as much as elastic vessels. The tunica externa or tunica adventitia is the outer layer of a blood vessel. https://www.answers.com/Q/What_has_the_thickest_tunica_media Normally tunica media is thinner tha… View the full answer The tunica externa or tunica adventitia is the outer layer of a blood vessel. Which of these has the thickest tunica media? Locate each of the three basic tunics. Middle layer or tunica media – This layer is formed predominantly by smooth muscle cells and elastin fibers. In the case of the aorta, the tunica media is the thickest and it contains 50 layers of alternating elastic and smooth muscle fibers. Tunica intima may form semilunar valves - especially numerous in limbs, prevent gravitational backflow of blood 3. 7. Arterioles are small arteries that deliver blood to capillaries. tunica definition: 1. a layer of tissue covering the inside or outside of a body part 2. a layer of tissue covering…. In addition, the tunica media of veins is much thinner than in arteries, and the adventitia is the thickest layer. The tunica media, the middle layer, usually is the thickest layer. Secondly, the tunica media is the thickest of the three layers in elastic arteries. Look it up now! It is the thickest layer, it makes up the fibrous skeleton, and is mostly cardiac muscle. The walls of both arteries and veins have three layers: the tunica intima, tunica media, and tunica adventitia. It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins. Aorta, Mammal, Cross Section (H & E). Fibroblasts are not present in the tunica media. Robert Cimrman. 100x. tunica media. The tunica media is usually the thickest layer and is composed of vascular smooth muscle cells (VSMCs) that contract or relax to regulate vessel diameter. Tunica Media … Smooth muscle cells can also be observed. Antonyms for tunica media. Caesars Rewards Visa® Card. Arteries and veins have the same layers of tissues in their walls, but the proportions of these layers differ. This may explains our observation of an indistinct tunica media in the intrahepatic portion. Microbiology Which of the following types of blood vessels have the proportionally thickest tunica media of all vessels? The fenestrations facilitate the diffusion of nutrients through the arterial wall. Inside the pulse, the thickest layer is tunica adventitia, made of connective tissue and nerves. Figure 1: Structure of Three Types of Arteries However, the main function of elastic arteries is to receive blood from the heart under high pressure and to gently pass the blood through arteries. Blood vessels are composed of three layers of tissue: tunica externa, tunica media, and tunica interna. The tunica is composed of tunicin, a carbohydrate closely related to cellulose. It consists of mostly smooth muscle and is innervated by the sympathetic nervous system. 4,5,41,47,51) Reportedly, it has an 18.84% of elastic fibers in the tunica media. Vessel structure is composed of a tunica intima, tunica media, and tunica externa. Kirsti Witter. Tunica Media Tunica media is normally the thickest layer in arteries. It has therefore been proposed to use a higher cut off value for elderly patients. 82. Artery 20. The middle layer, the tunica media, is the thickest part of the wall. 2) Tunica media Can have elastic membranes (C.T). B. This middle layer contains soft elastic tissues and, in the largest of the arteries, it houses nerves. Tunica externa (adventitia) is a connective tissue that anchors the artery to the nearby tissue. The middle layer, tunica media, is composed of smooth muscle and is thickest … 1.2.2 Tunica media Tunica media is the layer present in the middle of the vessel wall and is thickest among all the layers in arteries. The middle layer, the tunica media, is primarily smooth muscle and is usually the thickest layer. Less muscular. In histological structure, the tunica resembles connective tissue with a gelatinous basal substance. arteries veins capillaries arterioles Arteries and pulses consist of three layers, namely tunica intima, tunica media, and tunica adventitia. media Environment Soil, water, air, plants, animals or any other parts of the environment that can contain contaminants. B, Immunohistochemical detection of HA in the media of the aorta (g and j), and small renal (h and k), and retinal vessels (i and l) in WT (g through i) and Tg (j through l) mice. This substance has a gelatinous consistency, which makes possible the implantation in the tunica of cells that migrate from the cutaneous epithelium. What has the thickest tunica media? At this magnification, the tunica intima may be difficult to resolve, but the tunica media and tunia adventitia are easily observed. Learn more. Tunica media • 3-15 layers of VSMCs • no external elastic lamina • Tunica adventitia • thicker than tunica media • larger veins have longitudinal smooth muscle in adventitia • Tunica intima • endothelium • subendothelium • IEL generally not evident 81. Tunica Media. 2. The tunica media is relatively thin. The primary function of large blood vessels (i.e., arteries and veins) is the transport of blood to and from the heart, whereas smaller blood vessels (e.g., capillaries) enable substance exchange between the cells and blood. Tunica Intima - inner layer composed of the endothelium, subendothelial connective tissue, and a thin layer of elastic fibrils (the internal elastic membrane). In which of the following is an arterial portal system found? Vasa vasorum supply both the tunica adventitia and the tunica media of major arteries with nutrients and oxygen. Tunica Media. –big role in vasoconstriction. The tunica media is the thickest layer of the arterial wall and is composed of elastic fibers, SMCs, fibroblasts and extracellular matrix. Tunica media Tunica intima of a large artery consists of an endothelium and underlying CT. An internal elastic lamina is not readily visible, because it blends with the elastic lamellae in tunica media. Arterial tunica intima (histological slide) Tunica media. • Of the three types of vessels, arteries have the thickest tunica media (allowing stretch/recoil and vasoconstriction), veins have relatively thick tunica adventitia, and capillaries are the thinnest (allowing exchange of materials.) a. Kidney b. Liver c. Muscle d. Brain e. Stomach. Tunica Media. Arteries have a thicker tunica media with more elastic fibers when compared with the same layer in veins. The lumen is also smaller in size. This is because arteries have to withstand the pressure of the heart when it contracts, while veins do not have this problem. The tunica media is the thickest tunic; it is predominantly muscular in arterioles and most arteries, and it is predominantly elastic in the largest arteries (the so-called elastic arteries such as the aorta and the common carotid). The tunica media is the substantial middle layer of the vessel wall (see Figure 2) It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins; The tunica media consists of layers of smooth muscle supported by connective tissue that is primarily made up of elastic fibers, most of which are arranged in b) They have the thickest tunica media of all vessels, containing more smooth muscle and less elastin than elastic arteries. The tunica media also has fewer layers of smooth muscle cells. The tunica adventitia was the thickest layer in the IVC. Tunica media means “middle coat” and is the thickest layer. Interposed among these cells are variable amounts of elastic fibers and lamellae, reticular fibers (collagen type III), proteoglycans, and glycoproteins. Inner coat. The sub- endothelial layer of tunica intima is thicker. The role of the baroreceptors in adjusting blood pressure, called the baroreflex. This layer is much thicker in arteries than in veins. This sympathetic nervous system is what causes venospasms following changes in temperature or irritation within the vein ( 11 , 12 ). –larger arterioles have all 3 tunics •tunica media is mostly smooth muscle with a few 20-33 Varicose Veins • Blood pools in the lower legs in people who stand The five types of blood vessels are (in order of circulation): arteries, arterioles, capillaries, venules, and veins. A vein consists of three main layers connected by muscles and elastic connective tissue, according to the National Cancer Institute. The middle layer or the tunica media is the thickest layer in arteries made up of vascular smooth muscles. An external elastic lamina is found between the tunica media and the relatively thin tunica adventitia on the outside. However, capillaries are made up of a single layer of endothelial cells. The tunica media is the substantial middle layer of the vessel wall (see ). In the following list of characteristics, put "A" for artery, "C" for capillary, and "V" for vein: 1.___ contain the lowest pressure 2.___ has thick tunica media The predominantly longitudinal orientation of smooth muscle is an adaptation for propulsion of blood against gravity The tunica media is thicker in the arteries rather than the veins.The outer layer is the tunica adventitia and the thickest ... A thin membrane of elastic fibers in the tunica intima run parallel to the vessel. asked Mar 12, 2019 in Anatomy & Physiology by TheDoors. Which of the following vessels has the thickest tunica media? In which of the following is an arterial portal system found? Question 3. In human cardiovascular system: The blood vessels The tunica media, or middle coat, is thicker in arteries, particularly in the large arteries, and consists of smooth muscle cells intermingled with elastic fibres. Tunica media: It is the thickest coat, constituting 70% of the wall thickness. A vein has the same three layers as the artery shown here, but the middle layer (tunica media) of a vein is thinner and lacks smooth muscle tissue. An artery and vein frequently run together, and this facilitates their comparison. Qn1. Recent studies suggest that the adventitia has properties of a stem/progenitor cell niche in the artery wall that may be poised to respond to arterial injury. It is surrounded on top by the tunica adventitia or tunica externa, and underneath by the tunica intima. The growth of the tunica media of the ascending aorta was, in part, different from that of the aortic isthmus and descending aorta. 3) Tunica adventitia It is a thin layer of connective tissue. 2. The middle layer Tunica media is the thickest layer in arteries. It consists of circularly arranged elastic fiber, connective ... The middle layer is thicker in the arteries than it is in the veins: The inner layer, Tunica intima, is the thinnest layer. It ... The outer layer is Tunica adventitia and the thickest layer in veins. About this page. A)right atrium; systemic circuit ... What Tunica of the artery has smooth endothelium to prevent blood clotting and secreate biochemicals to inhibit aggregation. Only Tg demonstrate hHAS2 transgene expression in SMCs. Horseshoe Tunica Hotel & Casino - Caesars Entertainment. Humans have a closed circulatory system in which blood vessels carry blood to and from the heart and all the organs and tissues of the body. It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins. Histologically, the RA is a muscular artery. The blood is a connective tissue made of plasma (liquid material), red blood cells, white blood cells, and platelets. It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins. It consists of smooth muscle cells that encircle the blood vessel. The outermost layer, which attaches the vessel to the surrounding tissue, is the tunica externa or tunica adventitia. The tunica media: The tunica media, or media, is the middle layer of a vein’s wall. Which is the thinnest of the three blood vessels? The tunica media is the middle layer of a blood vessel. Which among the three is the thickest blood vessel? Identify the three layers of both arteries and veins and note the differences in thickness. This layer is thick and comprises the bulk of the vein. What are vasa vasorum? answer choices. Tunica adventitia or tunica externa is the outer layer of the blood vessel wall. It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins. The tunica media is relatively thin. Arteries carry blood from the heart to the tissues. The vessel wall has 3 layers - Tunica adventitia or externa, Tunica media and Tunica intima or interna. It also contains the Vasa Vasorum, a system which supplies blood to the walls of aorta itself. 7. It consists of mostly smooth muscle and is innervated by the sympathetic nervous system. In veins, this is the thickest layer. The tunica adventitia is relatively thin. The tunica media is thicker in the arteries rather than the veins.The outer layer is the tunica adventitia and the thickest ... A thin membrane of elastic fibers in the tunica intima run parallel to the vessel. Abstract—Conventional views of the tunica adventitia as a poorly organized layer of vessel wall composed of fibroblasts, connective tissue, and perivascular nerves are undergoing revision. Arteries Veins Tunica intima Endothelium appears wavy in Tunica intima of arteries . The tunica media is the thickest tunic; it is predominantly muscular in arterioles and most arteries, and it is predominantly elastic in the largest arteries (the so-called elastic arteries such as the aorta and the common carotid). It is lined by endothelium. 3. The tunica media is primarily smooth muscle. We estimated the density of von Willebrand factor-positive profiles of vasa vasorum visible in transversal histological sections of 123 tissue samples collected from five anatomical positions in the porcine aortae of growing pigs (n=25). tunica intima - (intima) innermost layer in both arteries and veins. It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins. Have endothelial cells that are more elongated. From: Biotextiles as Medical Implants, 2013. SURVEY. The tunica adventitia is the outermost layer of connective tissue that consists mostly of longitudinally arranged collagen and elastic fibers. As in the arteries, the walls of veins have three layers, or coats: an inner layer, or tunica intima; a middle layer, or tunica media; and an outer layer, or tunica adventitia.Each coat has a number of sublayers. It not only provides support for the vessel but also changes vessel diameter to regulate blood flow and blood pressure. the thickest layer of an artery wall is the tunica ___. Thickest layer of a wall of an artery. Fixes the artery to the surrounding structures. The _____ has the thickest wall because it pumps blood to the _____. This layer is the thickest layer of a vein’s lining and is made of loose connective tissues and an external elastic membrane. Remember, the tunica media should be the thickest of the three tunics. The outer layer, or "tunica adventitia," consists of collagen fibers and connective tissue. Stimulation of this layer by infusion of cold or irritating The internal elastic lamina is prominent and the tunica media contains up to 40 layers of smooth muscle cells. The tunica media is the thickest tunic; it is predominantly muscular in arterioles and most arteries, and it is predominantly elastic in the largest arteries (the so-called elastic arteries such as the aorta and the common carotid). A useful generalization is that the artery has a relatively thick wall and a small lumen, whereas a vein Medium vein, H&E (10x obj.) The elastic fibers within this layer appear as wavy lines between the smooth muscle cells. As the elastic arteries travel further from the heart they no longer need to deal with such high pressures and do not have to be so elastic. Q: Describe the epicardium. BIOM3002 Lecture Notes - Lecture 2: Simple Squamous Epithelium, Blood Simple, Tunica Media. Answer: b. Learn the differences between an artery and a vein. The tunica adventitia is composed of fibroelastic connective tissue, with much of its elastic component contributing to the make up of the elastic lamina surrounding the media. Do veins have more smooth muscle than arteries? Informatics (1) Electronic substrate on which to store information; digital media. ARTERY---MICROSCOPIC DETAIL and HISTOLOGY of the TUNICA MEDIA and TUNICA INTERNA (INTIMA), ELASTIC FIBERS, SMOOTH MUSCLE, ENDOTHELIUM, 250X. The tunica media is the substantial middle layer of the vessel wall (see ). A vein has the same three layers as the artery shown here, but the middle layer (tunica media) of a vein is thinner and lacks smooth muscle tissue. These fibers allow the arteries and veins to stretch to prevent over expansion due to the pressure that is exerted on the walls by blood flow. As in the arteries, the walls of veins have three layers, or coats: an inner layer, or tunica intima; a middle layer, or tunica media; and an outer layer, or tunica adventitia.Each coat has a number of sublayers. Q. cause venous blood flow to go in only one direction. In larger vessels the tunica media is composed primarily of elastic fibres.… The tunica media (New Latin "middle coat"), or media for short, is the middle tunica (layer) of an artery or vein. Tunica media is made up of smooth muscle cells, elastic tissue and collagen. Cross-Section of Artery and Vein. Tunica Media, Smooth muscle and elastin tissue 3. In all arteries, the tunica media is the thickest layer, but its composition varies among the three general classes of artery. Several blood vessels are scattered throughout the mesentric fat of this MESENTERY slide. Inside the arteries, the thickest layer is the tunica media or middle layer, made of connective tissue, fiber, and polysaccharides. asked Mar 23, 2019 in Anatomy & Physiology by TheCarpenter. The tunica media also has an external elastic lamina in … changes orientation and migrates to the tunica adventitia (Greep & Weiss). Petra Kochova. Structure of the vein. Inner layer or tunica intima – This is the first and thinnest layer covering the lumen of the artery and is made of endothelial cells mounted on a basement membrane. Review p20-32CVT.indd 2 17/6/08 16:07:25. Small arteries B. Tunica Intima. The heart has four chambers, two atria, and two ventricles. Tunica Media. From: Biotextiles as Medical Implants, 2013. The tunica media is the middle layer of the vessel wall, and it is the thickest … The tunica media is the substantial middle layer of the vessel wall (see Figure 20.3). The tunica media is primarily smooth muscle. The walls of both arteries and veins have three layers: the tunica intima, tunica media, and tunica adventitia. The tunica media is the substantial middle layer of the vessel wall (see Figure 20.1.2). It is made of smooth muscle cells and elastic fibers, allowing the artery to stretch without breaking as blood pulses through. The tunica media is the thickest tunic; it is predominantly muscular in arterioles and most arteries, and it is predominantly elastic in the largest arteries (the so-called elastic arteries such as the aorta and the common carotid). The Tunica adventitia is the outermost layer which comprises of loose connective tissue. It contains concentric layers of fenestrated elastic lamellae (laminae, membranes) that are separated by smooth muscle fibers. This layer is built of collagen, elastic fibers, and smooth muscle fibers. make the use of a skeletal muscle pump unnecessary for venous blood flow. The middle layer, the tunica media, is primarily smooth muscle and is usually the thickest layer. Larger arterioles have a lumen less than 100 to 300 µm in diameter. The adventitia fuses with surrounding tissue in the body. _____ inhibits fibrinolysis by competing with plasminogen and may contribute to the formation of atherosclerotic plaques. It consists of elastin, smooth muscle cells, collagen fibres and ground substance, which are synthesised and secreted by smooth muscle cells. Tunica Media. ... providing the smooth lining for blood to flow over; tunica media, middle layer and made up of muscle elastic tissue and the tunica adventitia, tough covering for protection. The tunica externa or adventitia has bundles of collagen fibers intermixed with a few elastic fibers and fibroblasts. It consists of loose connective tissue and contains longitudinally arranged bundles of smooth muscle as well as thick elastic fibers. The tunica media is the thickest tunic; it is predominantly muscular in arterioles and most arteries, and it is predominantly elastic in the largest arteries (the so-called elastic arteries such as the aorta and the common carotid). Answer: a The tunica is composed of tunicin, a carbohydrate closely related to cellulose. Summer Kick-off Sale. Biomechanics and Modeling in Mechanobiology, 2014. Medium vein, trichrome (4x obj.) Answer and Explanation: 1 Become a Study.com member to unlock this answer! https://sciemce.com/1343709/which-vessels-have-the-thickest-tunica-media Tunica Adventitia - the strong outer covering of arteries and veins. 2 synonyms for tunica: adventitia, tunic. most sm. (tunica media layer) has no more than six concentric rings of smooth muscle, and the tunica adventia (T.A.) anatomy-and-physiology; The arachnoid villi lack the tunica externa or adventitia found in blood vessels. Nakamachi et al. The smooth muscle cells not only provide support but also produce changes in the diameter of the blood vessel by contraction or relaxation. Book Now. It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins. The vasa vasorum (blood vessels of blood vessels) that nourish the wall of the vein are found in this tunica and may penetrate into the media or even the intima. Small veins C. Large arteries D. Large veins E. Capillaries Informatics (1) Electronic substrate on which to store information; digital media. 30 seconds. a. Tunica intima b. Tunica albuginea c. Tunica externa d. Tunica vaculosa e. Tunica media. 8. In general, the tunica externa protects and strengthens vessels, and attaches them to surrounding structures. The tunica media is the middle layer made up of smooth muscle, collagen and elastic tissue. Linguistics Plural of medium. Walls of veins are thinner because veins have lower blood pressure. The tunica media is the thickest tunic; it is predominantly muscular in arterioles and most arteries, and it is predominantly elastic in the largest arteries (the so-called elastic arteries such as the aorta and the common carotid). The tunica media is the substantial middle layer of the vessel wall (see Figure 2). 2. The minute-to-minute blood flow through the … These vessels are channels that distribute blood to the body. (2) Media with hyperlinks; hypermedia. The arteries are two types, depending on structure and function. Surrounding the tunica intima is the tunica media, comprised of smooth muscle cells and elastic and connective tissues arranged circularly around the vessel. Thirdly, the tunica adventitia consists of a thin connective tissue layer. Artery vs Vein Arterial system Venous system Lumen Smaller, rounder. Less developed. This layer is much thicker in arteries than in veins. They are elastic artery and muscular artery. a. Kidney b. Liver c. Muscle d. Brain e. Stomach. The middle layer or the tunica media is the thickest layer in arteries made up of vascular smooth muscles. –Thin tunica media with moderate amount of smooth muscle –Tunica externa is thickest layer • Contains longitudinal bundles of smooth muscle –Venae cavae, pulmonary veins, internal jugular veins, and renal veins . Have endothelial cells that are less elongated. A. The small artery has a thick, distinct, muscular tunica media and a narrow lumen, while the vein consists primarily of a tunica adventitia and has a larger lumen. Medium-sized veins have a tunica intima ANSWER 1. Zbyněk Tonar. [51] constructed a multi-scale FE. The muscular middle layer is called the tunica media, and the outermost layer is called the tunica adventitia. The tunica is a thickened cuticle of cutaneous epithelium that is colonized by cells, a unique phenomenon in the animal kingdom. Mention its role. Endothelium appears smooth in tunica intima of veins. Figure 14.4.9 A vein has the same three layers as the artery shown here, but the middle layer (tunica media) of a vein is … The smooth muscle fibers are present in the tunica intima which is the thickest and middle layer of arteries. Valves in veins. *Terms and conditions apply. The tunica adventitia is relatively thin. _____ have the thickest tunica media. The tunica media is thickest in elastic arteries. c) There is an elastic lamina on each face of the tunica media in muscular arteries. The tunica intima is the innermost layer of a blood vessel. Under the microscope, the tunica media is the thickest layer in arteries, and is much thicker in arteries than it is in veins. 22 Wound Essentials •Volume 3 • 2008 adventitia on the outside, tunica media (middle layer) and the tunica intima, an inner layer of ... of two layers of tunica media and tunica ad ventitia. You can see the three layers for an artery in Figure \(\PageIndex{7}\). Thickest Layer. The muscle cells and elastic fibres circle the vessel.

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