available light decreases, thus dilating the pupil. Pupillary
dilation is controlled primarily by the sympathetic nervous
system. Interruption of the innervation of the dilator
muscle can cause an abnormally small pupil, a condition
seen as part of Horner syndrome. Traumatic rupture of
iris muscles can cause an irregularly shaped pupil. Dilator
muscles can also be found in other parts of the body such
as the nose, where the dilator naris muscle aids in widening
the nostrils.
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