Elastic fibers Accounts for most of the stretch of vessels as well as other tissues( e. g. lungs) Composed of a core of elastin and a covering of microfibrils Covalently corss-link and assemble into a highly elastic network of fibers In arteries elastic fibers are arranged as concentric cylindrical lamellaeElastic fibers • Accounts for most of the stretch of vessels as well as other tissues (e.g., lungs). • Composed of a core of elastin and a covering of microfibrils. • Covalently corss-link and assemble into a highly elastic network of fibers. • In arteries, elastic fibers are arranged as concentric cylindrical lamellae. 6