In microanatomy they are found in endothelium and fenestrated capillaries and allow for the rapid exchange of molecules between the capillaries, sinusoid blood vessels and surrounding tissue. These pores may enlarge and contract in response to various stimuli such as the hormone noradrenaline. The elastic layer of the tunica intima is a fenestrated membrane.
In surgery a fenestra is a new opening made in a part of the body to enable drainage or access.
In biology the perforations in a perforate leaf are also described as fenestrae and the leaf also called a fenestrate leaf. The leaf window is also known as a fenestra, and is a translucent structure that transmits light, as in Fenestraria.
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