Vénuler

Vénuler is a term derived from the French word "vénule," which refers to a small vein. In biological and medical contexts, it often pertains to the venules within the circulatory system. These are the smallest veins, typically measuring between 10 and 100 micrometers in diameter. They collect deoxygenated blood from capillaries, which are the smallest blood vessels, and channel it into larger veins.

The walls of venules are relatively thin and permeable, allowing for the passage of certain substances, such as white blood cells and fluid, into the surrounding tissues. This permeability is particularly important during inflammatory responses, where venules become more permeable, facilitating the migration of immune cells to sites of infection or injury. The structure of venules includes a thin layer of smooth muscle and connective tissue surrounding an inner endothelial lining.

The formation of venules is a crucial part of vascular development. They play a role in regulating blood flow and pressure within the venous system. Understanding the physiology and behavior of venules is important in various fields, including physiology, pathology, and pharmacology, as they are involved in numerous physiological processes and can be affected by various diseases.