What is the inner layer of venules composed of?

The inner layer of venules is primarily composed of squamous endothelial cells, which are a type of epithelial cell. These cells form a thin layer lining the lumen of blood vessels, including venules, and play a crucial role in regulating the exchange of substances between the bloodstream and surrounding tissues. Their flat, squamous shape facilitates this exchange, allowing for the passage of nutrients, waste products, and immune cells.

Overall, the endothelial layer is vital in maintaining vascular health and function. It helps regulate blood flow and pressure, as well as contributes to the inflammatory response and the formation of new blood vessels. The other layers and types of tissues like connective tissue, smooth muscle, and elastic tissue, while present in different parts of the vascular system, do not characterize the inner layer of venules specifically.