What does blood valve
The venous system of the human body
The venous system is part of the bloodstream and uses a complex anatomical system to ensure that blood is transported back to the heart from the most remote areas of our body. The venous system is divided into a deep and a superficial venous system.
The superficial venous system
The superficial veins are just below the skin. Strictly speaking, they run through the subcutaneous fatty tissue between the skin and muscles. They always direct the blood from the upper layers of the skin towards the deep venous system.
In addition to the widely and finely branched veins, there are two large and clinically important "trunk veins". The great saphenous vein runs on the inside of the leg from the foot over the lower thigh and thigh to the groin. The second trunk vein, the small saphenous vein, runs from the outside of the foot over the back of the lower leg and opens into the popliteal vein above the hollow of the knee.
Connecting veins (perforating veins) direct the blood through the muscles into the depths and thus link the superficial and deep venous systems with one another. Each leg has about 120 connecting veins.
The deep venous system
The deep veins, also called guide veins, run deep in the muscles near the bones and have very elastic vein walls. They have to, as 90% of the blood is directed back to the heart from here. Large blood reserves are also made available in the deep venous system in order to be able to quickly supply our body with the blood it needs when it is exposed to stress.
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