a smooth muscle is in the iris.
a smooth muscle is in the iris.
what type of muscle is in the iris?
a smooth
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