It's important to note that a diamond's carat weight does not equal size. Because of differences in depth and cut, two diamonds with identical diameters may in fact be two completely different sizes. Therefore, it is possible to buy a diamond that looks bigger than another that may actually have a smaller carat weight. When buying a diamond, consider the length, width and depth of a stone as well as the surface of the diamond (the part that will actually show when the diamond is set).
The tunica adventitia is the outermost layer of the arteries and veins. The word 'adventitia' in tunica adventitia comes from the Latin 'adventicius,' which means 'coming from outside.' This strong outer layer is composed of connective tissue that allows the blood vessel to withstand forces acting on the vessel wall.ll arteries and veins contain three layers. The innermost layer is called the tunica intima. The muscular middle layer is called the tunica media, and the outermost layer is called the tunica adventitia.
More Answers. The tunica externa, also known as the tunica adventitia, is the outermost layer of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and is supported by external elastic lamina.The collagen serves to anchor the blood vessel to nearby organs, giving it stability.unica externa or tunica adventitia is the outer most layer of the blood vessels. It is mostly composed of collagen which helps to anchor the blood vessel with nearly organ. The second or middle layer of blood vessel is tunica media.