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sphincter pupillae

Go to external page http://purl.obolibrary.org/obo/UBERON_0001607

A sphincter muscle that is part of the iris. [ http://en.wikipedia.org/wiki/Iris_sphincter_muscle ]

Synonyms: musculus sphincter pupillae iris sphincter muscle M. sphincter pupillae sphincter muscle of pupil

This is just here as a test because I lose it

Term information

database cross reference
Subsets

uberon_slim

depicted by

http://upload.wikimedia.org/wikipedia/commons/2/2f/Gray878.png

function notes

constricts iris

has related synonym

sphincter pupillae

pupillary constrictor muscle

constrictor pupillae

pupillary sphincter

sphincter pupillae muscle

m. sphincter pupillae

circular fibers

pupillary sphincter muscle

iris sphincter

iris constrictor

spincter pupillae

iris constrictor muscle

id

UBERON:0001607

taxon notes

WP says: It is found in vertebrates and some cephalopods; this class refers to the vertebrate structure

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]