What does the term fenestrated refer to in a medical context?

In a medical context, the term "fenestrated" specifically refers to structures that possess openings or holes. This term is commonly used to describe certain anatomical features or surgical constructs. For example, in the context of blood vessels, fenestrated capillaries are known to have small pores, allowing for greater permeability, which is essential for the exchange of substances between blood and tissues. Fenestrated membranes or surgical drapes also have openings to facilitate air or fluid flow. Understanding this term is important because it indicates a specific characteristic that can influence physiological processes or medical procedures.