Back عضلة مصرة القزحية Arabic Sfinkterski mišić šarenice BS Múscul esfínter de la pupil·la Catalan Musculus sphincter pupillae German Músculo esfínter de la pupila Spanish ماهیچه تنگکننده عنبیه Persian Muscle sphincter de la pupille French Mišić sfinkter zjenice Croatian Musculus sphincter pupillae Hungarian Muscolo sfintere dell'iride Italian
| Iris sphincter muscle | |
|---|---|
 Iris, front view. (Muscle visible but not labeled.) | |
 The upper half of a sagittal section through the front of the eyeball. ("Sphincter of pupil" labeled near bottom-center.) | |
| 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 | |
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.
- ^ a b Gest, Thomas R; Burkel, William E. (2000). "Anatomy Tables - Eye". Medical Gross Anatomy. University of Michigan Medical School. Archived from the original on 2010-05-26.
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