ANNULUS IRIDIS Meaning and
Definition
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Annulus iridis is a term derived from Latin, which refers to a specific anatomical feature of the eye. An annulus, in general, signifies a ring or a circular structure, while iridis pertains to the iris, which is the colored, circular portion of the eye surrounding the pupil. Hence, annulus iridis is commonly known as the iris ring or iris ruff.
In human anatomy, the annulus iridis is the outermost region of the iris where it connects with the ciliary body and the sclera. It forms a circular boundary between the iris and the white of the eye. This part of the iris often differs in color or texture compared to the central portion, leading to distinct patterns observed in individuals. The annulus may be lighter or darker, creating a ring-like appearance, especially noticeable in those with light-colored eyes.
The annulus iridis plays a crucial role in regulating the amount of light that enters the eye by controlling the dilation and constriction of the pupil. It consists of smooth muscle fibers, known as the dilator and the sphincter pupillae muscles, which act in opposition to each other. These muscles allow the pupil to expand or contract, adjusting the aperture and hence regulating the amount of light reaching the retina.
Overall, the annulus iridis is a defining feature of the iris, providing structural support and aiding in the control of pupil size, ultimately contributing to the eye's visual functions.
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Ring of the iris, one of two zones on the anterior surface of the iris, separated by a circular line concentric with the pupillary border; the a. iridis minor is the inner of the two zones and is much narrower than the other, a. iridis major.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for ANNULUS IRIDIS
- znnulus iridis
- snnulus iridis
- wnnulus iridis
- qnnulus iridis
- abnulus iridis
- amnulus iridis
- ajnulus iridis
- ahnulus iridis
- anmulus iridis
- anjulus iridis
- annylus iridis
- annhlus iridis
- annjlus iridis
- annilus iridis
- ann8lus iridis
- ann7lus iridis
- annukus iridis
- annupus iridis
- annuous iridis
- annulys iridis
Etymology of ANNULUS IRIDIS
The word "annulus iridis" comes from Latin. Here is the breakdown of the etymology:
- "Annulus" (plural: "annuli") is a Latin word meaning "ring" or "little ring".
- "Iridis" is the genitive form of the Latin word "iris", which means "rainbow". In this context, "iridis" refers to the iris (colored part of the eye) as a whole, including the ring-shaped structure within it.
So, the term "annulus iridis" literally translates to "ring of the iris" in Latin, describing the circular shape found within the iris of the eye.
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