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The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a smooth muscle [2] of the eye, running radially in the iris and therefore fit as a dilator.
These results suggest that the iris sphincter muscle plays a primary role in controlling rapid pupil dilation with the onset of movement, whereas the iris dilator and iris sphincter muscles are involved in sustained pupil dilation during movement.
The iris dilator muscle is a smooth muscle located in the outer part of the iris that is responsible for dilating the pupil. It is primarily regulated by the sympathetic nervous system through adrenergic receptors, particularly the α1 receptors.
30 lip 2023 · Sympathetic innervation from the superior cervical ganglion project to the dilator muscle of the iris via long ciliary nerves to control pupil dilation. The sympathetic and parasympathetic systems work in opposition to constantly adjusting the pupillary aperture.
25 lut 2008 · Our pupils naturally dilate in darkness and constrict in bright lights through the actions of two opposing muscles in the iris, the iris dilator and sphincter.
Relaxed iris dilator muscle resistant to adrenergic agonists should be expected with clinical drugs shown to relax the iris dilator (e.g., antagonists at alpha(1)AR, endothelin-A, angiotensin receptors, nitric oxide donors such as nitrates), and/or diseases associated with endothelial dysregulation (e.g., congestive heart failure, diabetes ...
1 mar 2016 · It causes constriction of the iris circular (sphincter) muscle as well as ciliary muscle to produce miosis and to block the accommodation reflex with focusing to near vision respectively. It also facilitates the outflow of aqueous humor, thus reducing the intraocular pressure.
