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Annulus
From Wikipedia, the free encyclopedia
(Redirected from Punctured disc)
Look up annulus in Wiktionary, the free dictionary.
Annulus (or anulus), being the Latin for "ring", is a term used to describe various ring or circle shaped objects:[1][2]
- Annulus (entomology), an antennal unit in simple antennae, or a ring-like marking or structure surrounding a joint or segment
- Annulus (anatomy) refers to several structures in human anatomy. The spelling "anulus" is preferred under Terminologia Anatomica, but both spellings are commonly found. Examples include:
- Annulus fibrosus cordis, the ring-like structure on a heart valve where the valve leaflets are anchored
- Annulus fibrosus disci intervertebralis, the outer wall of the invertebral disc
- Annulus femoralis
- Annulus inguinalis superficialis
- Annulus inguinalis profundus
- Annulus tendineus communis
- Annulus (ichthyology), the annual rings that form in fish scales or bone sections
- Annulus (mycology), the "ring" on a mushroom stem
- Annulus (astronomy), the ring of light from the visible part of the photosphere seen at the greatest extent of an annular eclipse
- Annulus (cosmology), the ring around the lens on which strong gravitationally lensed images of one source appear
- Annulus (mathematics), a ring-shaped geometric figure
- Annulus (firestop), the space in a penetration seal surrounding a penetrant, i.e. between a pipe or electrical conduit, or cable and a sleeve, with or without a firestop
- Annulus (oil well), the tube shaped void between a pipe string and a surrounding pipe string or formation.
- Annulus (microscopy), a circular opening "disk" below a specimen slide, required for Phase Contrast microscopy
- Annular hurricane, a hurricane that is nearly symmetrical and takes longer to weaken than normal hurricanes.
- ^ Martim de Albuquerque (1873). Notes and Queries. Original from the University of Michigan: Oxford University Press, Page 119.
- ^ (1864) An Irish-English Dictionary. Original from Oxford University: J. Duffy, Page 7.
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