What is Fenestra?

Information about Fenestra

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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
Not to be confused with Poor, Poore, or Pour.


Pore may refer to:

In animal biology and microbiology:
  • Sweat pore, an anatomical structure of the skin of humans (and other mammals) used for secretion of sebum

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epithelium is a tissue composed of a layer of cells. Epithelium lines both the outside (skin) and the inside cavities and lumen of bodies. The outermost layer of our skin is composed of dead stratified squamous, keratinized epithelial cells.
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The blood vessels are part of the cardiovascular system and function to transport blood throughout the body. The most important types, arteries and veins, carry blood away from or towards the heart, respectively.
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Norepinephrine (INN)(abbr. norepi or NE) or noradrenaline (BAN) is a catecholamine and a phenethylamine with chemical formula C8H11NO3. The natural stereoisomer is L -(−)-(R)-norepinephrine.
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skull is a bony structure found in many animals which serves as the general framework for the head. The skull supports the structures of the face and protects the head against injury.

The skull can be subdivided into two parts: the cranium and the mandible.
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See also Mr Bones (disambiguation) and Boner


Bones are rigid connective organs that make up the skeleton of vertebrates. Bones are primarily comprised of osseous tissue which may also be referred to as bone or bone tissue.
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Latin 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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Plural is a grammatical number, typically referring to more than one of the referent in the real world.

In the English language, singular and plural are the only grammatical numbers.

In English, nouns, pronouns, and demonstratives inflect for plurality.
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window is an opening in an otherwise solid and opaque surface that allows the passage of light and, if not closed or sealed, air and sound. Windows are usually glazed or covered in some other transparent or translucent material.
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