Dilator pupillae
They are
involuntary muscle fibers of the iris , which running radially from papillary margin
to periphery .
It is supplied by
sympathetic nerves from the superior cervical ganglion. It is widening the pupil and allowing for more light
to pass through the eye.
Some condition like
carcinoma of the lung, thyroid or oesophagus or metastatic lymph nodes may
involve sympathetic trunk and give rise Horner’s syndrome,. One of the characteristic feature of Horner’s syndrome is
slight constriction of pupil because
dilator papillae muscle losses it innervations
so fail to dilate pupil .
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