Definition of fenestra in English:

fenestra

Line breaks: fen|es¦tra
Pronunciation: /fɪˈnɛstrə
 
/

noun (plural fenestrae /-triː/)

  • 1 Anatomy & Zoology A small natural hole or opening, especially in a bone. The mammalian middle ear is linked by the fenestra ovalis to the vestibule of the inner ear, and by the fenestra rotunda to the cochlea.
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    • Displacement of bones obscures anatomical details, but the fenestra ovalis seems to be absent.
    • The stapes terminates at a well-defined fenestra ovalis, suggesting that the stapes was specialized for hearing.
    • Most of the basal plate has been eliminated to accommodate the increased size of the fenestra ovalis.
  • 2 Medicine An artificial opening.
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    • Similarly, the postfrontal is damaged ventrally between the orbit and the infraorbital fenestra.
    • There is a sharp crest along the median symphysis, and the symphysis protrudes into the pelvic fenestra but does not meet with its ischial counterpart.
  • 2.1An opening in a bandage or cast.
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    • In our experiments, it is clear that extended imaging does cause the cells to respond; imaging for more than 1.5-2 h results in a significant enlargement of fenestrae and eventually causes the cells to detach.
    • The incomplete squamosals also slope laterally and ventrally away from the parietals, slightly depressing posterior margin of the supratemporal fenestrae.
    • The fused parietals form the posterior two-thirds of the sagittal crest, expanding posteriorly to form a flattened, sculpted deck behind the supratemporal fenestrae adjacent to the squamosals.
  • 2.2A perforation in a forceps blade.
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    • This expansion allows the jaw musculature to be stronger and also permits a wider gape (in other amniotes, the lateral temporal fenestrae perform a similar function).
  • 2.3A hole made by surgical fenestration.
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    • The large post-temporal fenestrae (large holes in the back of the skull) of turtles allow the jaw musculature to expand beyond the confines of the adductor chamber.
    • As experience mounted the time taken for surgery fell, bigger fenestra were created and the propensity for iatrogenic trauma and hence postoperative scarring diminished.

Origin

early 19th century (as a botanical term denoting a small scar left by the separation of the seed from the ovary): from Latin, literally 'window'.

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