part of an eye From Wikipedia, the free encyclopedia
The iris (plural: irides or irises) is a thin, circular structure in the eye. It controls the diameter and size of the pupils.
Iris | |
---|---|
Details | |
Precursor | Mesoderm and neural ectoderm |
Part of | Front of eye |
System | Visual system |
Artery | long posterior ciliary arteries |
Nerve | long ciliary nerves, short ciliary nerves |
Identifiers | |
Latin | iris |
MeSH | D007498 |
TA | A15.2.03.020 |
FMA | 58235 |
Anatomical terminology |
Eye color is the color of the iris. In humans, the iris may look green, blue, brown, hazel (a combination of light brown, green and gold), grey, violet, or even pink. In response to the amount of light exiting the eye, muscles attached to the iris expand or contract the pupil. The larger the pupil, the more light can enter the eye and reach the retina.
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