pupillary sphincter

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Noun1.pupillary sphincter - a ring of smooth muscle surrounding the iris
musculus sphincter pupillae
eye, oculus, optic - the organ of sight
anatomical sphincter, sphincter, sphincter muscle - a ring of muscle that contracts to close an opening
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References in periodicals archive
This is mainly due to the nonlinear length-tension property of the pupillary sphincter and dilatory muscles (Usui & Clark, 1978.).
Pupil examination: validity and clinical utility of an automated pupillometer
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