Iris dilator muscle | |
---|---|
Details | |
Origin | Outer margins of iris[1] |
Insertion | Inner margins of iris[1] |
Nerve | Long ciliary nerves (sympathetics) |
Actions | Dilates pupil |
Antagonist | Iris sphincter muscle |
Identifiers | |
Latin | musculus dilatator pupillae |
TA98 | A15.2.03.030 |
TA2 | 6763 |
FMA | 49158 |
Anatomical terms of muscle |
The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a smooth muscle[2] of the eye, running radially in the iris and therefore fit as a dilator. The pupillary dilator consists of a spokelike arrangement of modified contractile cells called myoepithelial cells. These cells are stimulated by the sympathetic nervous system.[3] When stimulated, the cells contract, widening the pupil and allowing more light to enter the eye.
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