venous valve , także: venous valvula

He was the first to describe venous valves.

The venous valves assist in maintaining the superficial-to-deep direction of the blood flow.

A series of venous valves called the perforating system interconnects the superficial and deep systems.

At its right side it is fused with the left venous valve and the septum spurium.

These cells form an ovoid called sinoatrial node, on the left venous valve.

Inflammation is thought to play a role as well as damage to the venous valves from the thrombus itself.

The upper right venous valve disappearing.

Amato Lusitano described venous valves and guessed their function.

But as you may know, many veins, particularly in the legs/arms, have one-way valves called "venous valves".

The right and left venous valves fuse and form a peak known as the spurium septum.

CVI is a pathological condition caused either by the congenital absence of or damage to venous valves in the superficial and communicating systems.

As functional venous valves are required to provide for efficient blood return from the lower extremities, CVI often occurs in the veins of the legs.

Most veins have one-way flaps called venous valves that prevent blood from flowing back and pooling in the lower extremities due to the effects of gravity.

At the beginning, these valves are large but the left venous valve and the septum spurium fuse with the developing atrial septum.

Chronic wound healing may be compromised by coexisting underlying conditions, such as venous valve backflow, peripheral vascular disease, uncontrolled edema and diabetes mellitus.

He discovered the circulation of the blood, and through dissections of the Azygos vein, he was the first to observe and speculate about the venous valves found there.

It contains the major blood vessels of the scalp, which bleed profusely upon injury, partly due to the absence of venous valves found in the circulation below the neck.

Charles Estienne publishes De dissectione partium corporis humani, libri tres, including a description of the venous valves of the liver.

Venous ulcers (stasis ulcers, varicose ulcers, or ulcus cruris) are wounds that are thought to occur due to improper functioning of venous valves, usually of the legs.

Once inside the lumen of the lymphatic vessels, the fluid is guided along increasingly larger vessels, first with rudimentary valves to prevent backflow, which later develop into complete valves similar to the venous valve.

Batson, and others had recognized that blood flow in the cerebrospinal venous system was bi-directional, a unique feature that was enabled by a general lack of venous valves in these venous plexi.

The exact etiology of venous ulcers is not certain, but they are thought to arise when venous valves that exist to prevent backflow of blood do not function properly, causing the pressure in veins to increase.

Most of Naki's work under Goetz involved anaesthetising dogs, but Naki also assisted in operating on a giraffe "to dissect the jugular venous valves to determine why giraffes do not faint when bending to drink."

Edema is commonly observed in the feet and legs, particularly in individuals with poorly functioning venous valves, and in the belly or abdomen (ascites), and around the eyes, but can occur anywhere, especially in response to gravity.

This view has been superseded by the concept of the thoracic pump, whereby sternal compression causes a generalised rise in intrathoracic pressure which is selectively transmitted to the arterial circulation because of closure of the venous valves.