A muscle encircling the eye and controlled by parasympathetic fibers. It constricts the pupil during accommodation or in bright illumination. It originates from the Edinger-Westphal nucleus and enters the eye through the short ciliary nerves.
 

Also Known As

  • Circular Muscle of Iris
  • Circular Fibers
  • Pupillary Sphincter
  • Sphincter Pupillae