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The iris consists of two layers: the front pigmented fibrovascular layer known as a stroma and, behind the stroma, pigmented epithelial cells.. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds.
In ancient Greek religion and mythology, Iris (/ ˈ aɪ r ɪ s /; EYE-riss; Ancient Greek: Ἶρις, romanized: Îris, lit. 'rainbow,' [2] [3] Ancient Greek:) is a daughter of the gods Thaumas and Electra, [4] the personification of the rainbow and messenger of the gods, a servant to the Olympians and especially Queen Hera.
Iris is a flowering plant genus of 310 accepted species [1] with showy flowers.As well as being the scientific name, iris is also widely used as a common name for all Iris species, as well as some belonging to other closely related genera.
Iris most often refers to: Iris (anatomy), part of the eye; Iris (color), an ambiguous color term; Iris (mythology), a Greek goddess; Iris, a genus of flowering plants;
Immune reconstitution inflammatory syndrome (IRIS) is a condition seen in some cases of HIV/AIDS or immunosuppression, in which the immune system begins to recover, but then responds to a previously acquired opportunistic infection with an overwhelming inflammatory response that paradoxically makes the symptoms of infection worse.
The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.
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Iris (from Greek Ἶρις Ancient Greek:, the messenger of the gods among themselves and the personification of ἶρις, the "rainbow") is a feminine name.. The name came into use in English-speaking countries in the 1500s, first in reference to the goddess, and was later used along with other Ancient Greek names revived by 17th-century British poets, such as Doris and Phyllis.