A condition affecting the system of veins in legs with venous hypertension resulting in different pathologies that involve swelling, ulcerations, pain, skin changes, and edema is called chronic venous insufficiency (Eberhardt and Raffetto, 2005). It is necessary to understand normal venous function and anatomy to analyze the venous insufficiencies pathology. The peripheral venous system serves as a conduit returns blood into the heart and as a reservoir where blood is stored. Appropriate operation of the peripheral venous system is dependent on a series of muscle pumps and valves (Eberhardt and Raffetto, 2005). Blood entering the venous system of lower extremities has ...
Essays on Groin
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Introduction
The building of tunnels dates back to the canal age. The first English canal tunnel was that of James Brindley on the Bridgewater canal directly entering Worsely coal mine (Muir 14). It was opened in 1761 and subsequently extended. This marked the beginning of tunneling, with numerous tunnels on the extending canal network. Brindley’s next achievement was the Harecastle tunnel built on the summit of the Grand Trunk Canal that was later damaged by mining activities. Since then tunneling has been an important aspect as far as infrastructure is concerned not only in the construction industry but also ...