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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.
28 kwi 2022 · The dilator pupillae muscle is a ring of contractile cells within the iris. These cells are arranged radially, such that their contraction facilitates pupillary dilation (mydriasis). The dilator pupillae muscle receives innervation from the sympathetic nervous system.
30 lip 2023 · The sphincter muscle contracts the pupil in a circular motion, while the dilator muscles enlarge the pupil by pulling the iris radially. The iris collarette is the thickest portion of the iris, where the sphincter and dilator muscles overlap.
Nerve: Superior cervical ganglion (sympathetics) Action: Pupil dilation. Antagonist: Iris sphincter muscle. The radiating muscular fibers of the iris form the Dilatator pupillae; they converge from the circumference toward the center, and blend with the circular fibers near the margin of the pupil.
Download scientific diagram | The structure and development of the human iris. a Cartoon of the iris musculature, showing the position of the sphincter (shaded yellow) and dilator muscles....
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.
3 lis 2023 · Being located in the stromal layer of iris, sphincter pupillae is cushioned in the connective tissue of the stroma and stromal neurovasculature, fibroblasts and melanocytes. The outer margin of sphincter pupillae is related to the myoepithelial cells of dilator pupillae muscle.
