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Preferred Label : sphincter pupillae;

Uberon definition : A sphincter muscle that is part of the iris.;

Uberon synonym : iris sphincter muscle; musculus sphincter pupillae; sphincter muscle of pupil; M. sphincter pupillae;

Uberon related term : spincter pupillae; iris constrictor muscle; iris sphincter; sphincter pupillae muscle; pupillary constrictor muscle; iris constrictor; constrictor pupillae; pupillary sphincter muscle; pupillary sphincter; sphincter pupillae; circular fibers;

Uberon Function note : constricts iris;

Uberon Taxon note : In humans, it functions to constrict the pupil in bright light or during accommodation. Its dimensions are about 0.75 mm wide by 0.15 mm thick. It is controlled by parasympathetic fibers that originate from the Edinger-Westphal nucleus, travel along the oculomotor nerve (CN III), synapse in the ciliary ganglion, and then enter the eye via the short ciliary nerves. Initially, all the myocytes are of the smooth muscle type, but much later in life, so that ultimately most cells are of the striated muscle type. [WP,unvetted];

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Keyword's position in hierarchy(ies) : arborescence

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A sphincter muscle that is part of the iris.

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06/05/2025


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