Iris sphincter muscle
Muscle in the eye which constricts the pupil / From Wikipedia, the free encyclopedia
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The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called the iris. It encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil.
Quick Facts Details, Origin ...
Iris sphincter muscle | |
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Details | |
Origin | Encircles iris[1] |
Insertion | Encircles iris[1] |
Artery | Long posterior ciliary arteries |
Nerve | Short ciliary nerves |
Actions | Constricts pupil |
Antagonist | Iris dilator muscle |
Identifiers | |
Latin | musculus sphincter pupillae |
TA98 | A15.2.03.029 |
TA2 | 6762 |
FMA | 49157 |
Anatomical terms of muscle |
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