It is a muscle that dilates the pupil. It surrounds the iris and serves to constrict the pupil during accommodation or in bright light through the pupillary light reflex. Thus, the iris determines the level of light that gets to the retina by controlling the diameter of the pupil.

Also Known As

  • Dilator Iridis
  • Dilator of Pupil
  • Musculus Dilator Iridis
  • Musculus Dilatator Pupillae
  • Iris Dilator Muscle
  • Pupil Dilator Muscle
  • Radiating Fibers
  • Pupillary Dilator
  • Radial Muscle of Iris