Iris Dilator Muscle
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a smooth muscle of the eye, running radially in the iris and therefore fit as a dilator. It has its origin from the anterior epithelium. It is innervated by the sympathetic system, which acts by releasing noradrenaline, which acts on 1-receptors. Thus, when presented with a threatening stimuli that activates the fight-or-flight response, this innervation…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a smooth muscle of the eye, running radially in the iris and therefore fit as a dilator. It has its origin from the anterior epithelium. It is innervated by the sympathetic system, which acts by releasing noradrenaline, which acts on 1-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. The iris dilator muscle fibers course radially through the iris. Iris sphincter muscle, Mydriasis, Sympathetic connections of the ciliary and superior cervical ganglia.