sphincter is the type of muscle that is in the iris.
what type of muscle is in the iris?
sphincter
iris sphincter muscle





























the iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called the iris. it encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil.





























section::::comparative anatomy.





























this structure is found in vertebrates and in some cephalopods.





























section::::general structure.





























all the myocytes are of the smooth muscle type. 





























its dimensions are about 0.75 mm wide by 0.15 mm thick.





























section::::mode of action.
iris sphincter muscle
bullet::::- "iris galatica"





























bullet::::- "iris graeberiana"





























bullet::::- "iris hippolyti"





























bullet::::- "iris hymenospatha"





























bullet::::- "iris inconspicua"





























bullet::::- "iris khassanovii"





























bullet::::- "iris kopetdagensis"





























bullet::::- "iris kuschakewiczii"





























bullet::::- "iris leptorhiza"





























bullet::::- "iris linifolia"





























bullet::::- "iris magnifica"





























bullet::::- "iris maracandica"





























bullet::::- "iris microglossa"





























bullet::::- "iris narynensis"





























bullet::::- "iris narbutii"





























bullet::::- "iris nicolai"





























bullet::::- "iris nusairiensis"





























bullet::::- "iris odontostyla"





























bullet::::- "iris orchioides"





























bullet::::- "iris palaestina"





























bullet::::- "iris parvula"





























bullet::::- "iris persica"





























bullet::::- "iris planifolia"





























bullet::::- "iris platyptera"





























bullet::::- "iris popovii"





























bullet::::- "iris porphyrochrysa"





























bullet::::- "iris postii"





























bullet::::- "iris pseudocaucasica"





























bullet::::- "iris regis-uzziae"





























bullet::::- "iris rosenbachiana"





























bullet::::- "iris schischkinii"





























bullet::::- "iris stenophylla"





























bullet::::- "iris stocksii"
iris subg. scorpiris