Physiology and Functional Anatomy of the Venous System

摘要: To study regional differences of mechanical properties veins and the contribution tissue components to these properties, pressure-volume relationships were obtained with cylindrical segments isolated dog peripheral trunk veins. The transmural pressure segment was raised up 20 cmH2O then reduced 0 by increasing decreasing intraluminal volume at a constant rate. venous also constructed in same way after treatment 1 mg/ml collagenase for 30 min, 0.1 elastase 5 or hyaluronidase 60 min. curves lower upper extremities jugular are curvilinear considerable convexity toward axis. It is apparent that most increment results from tangential distension within physiological range pressure. On other hand, intrathoracic suprarenal inferior caval concave convex higher A producing collapse about −8 cmH2O, lowest all There marked non-uniform distensibility walls related local architecture collagen elastic fiber content smooth muscles walls. Treatment produced significant increase incremental elasticity 0–2 (E0−2). treatment, however, caused no effect on E10−20. induced parameters. anatomical functional characteristics distribution valves examined. In trees humans, monkeys, dogs, rabbits, bicusps always found positions angles under inguinal ligaments, but not superior When valve exists, confluence tributaries able find upstream compartment main vein. where compressed mechanically movement joints, stretch tendons fasciae.