(pupillary sphincter or circular muscle of the iris) the smooth muscle that functions to constrict the pupil. It is innervated by the parasympathetic fibers in CN 3 via the ciliary ganglion.
« Back to Glossary Index« Back to Glossary Index
(pupillary sphincter or circular muscle of the iris) the smooth muscle that functions to constrict the pupil. It is innervated by the parasympathetic fibers in CN 3 via the ciliary ganglion.
« Back to Glossary Index