Scanning electron mocrograph of a liver sinusoid with fenestrated endothelial cells. Fenestrae are approx 100 nm diameter, and sinusoidal width 5 micrometres. Original magnification 30,000
'Fenestrae' (singular: 'fenestra') are small
pores in
epithelial cells to allow for rapid exchange of molecules between
blood vessels and surrounding tissue. These pores can enlarge and contract at the action of various stimuli such as
noradrenaline.
In anatomy, the term is used to refer to natural (as opposed to traumatic) openings in the
skull or other
bones.
Fenestrae is the
Latin plural for
windows.
See also
★
Temporal fenestra
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