The cerebral venous system is as important as its arterial systém. The authors have been studying cerebral venous problem for a long time. In the prezent study, the author's have researched venous complications and problem correlated to biomechanical and hemodynamical studies. The histobiomechanical characteristics of bridging veins and cerebral sinuses were studies with the test's system MTS 858.2 Mini Bionix (unique testing system in Europe). The bridging veins have a very low stronghold on longitudinal traction. Sinuses, on the other hand, are very rigid. This might influence blood outflow from the brain in normal physiology and any pathological situation, including head trauma. The authors developed a special program for modeling the cardiovascular system and the cerebral venous system. In this study, they illustrate the problem of bridging veins and the venous sinuses. From biomechanical and physiological view-point, they propose a venous classification of the cardiovascular system has the potential to change after application of treatment. The authors report on clinical problem and aspects (destruction of bridging veins during trauma, carotid-cavernous fistulas, and venous neurological deficits).