noun (plural fenestrae /-trē/ /-trī/)
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.
- 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.
- 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.
- 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.
- 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.
- 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.
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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