A smooth muscle of the eye, running radially in the iris that functions as a dilator. [WP,unvetted]. [ http://en.wikipedia.org/wiki/Iris_dilator_muscle ]

Synonyms: radial muscle of iris pupillary dilator muscle dilator pupillae muscle dilator pupillae musculus dilatator pupillae iris dilator muscle dilator of pupil dilator muscle of pupil

This is just here as a test because I lose it

Term information



latin term
musculus dilatator pupillae [ FMA:TA FMA:49158 ]

depicted by


function notes

It is innervated by the sympathetic system, which acts by releasing noradrenaline, which acts on alpha1-receptors. Thus, when presented with a threatening stimuli that activates the fight-or-flight response, this innervation dilates the iris, thus temporarily letting more light reach the retina

has related synonym

musculus dilator pupillae

dilator pupillae muscle

pupillary muscle

iris dilator

pupil dilator muscle

pupillary dilator

radiating fibers

musculus dilatator pupillae

radial muscle

pupil dilator