Terminology Service for NFDI4Health
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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 ]

Term info

Label

sphincter pupillae

Synonyms
  • M. sphincter pupillae
  • iris sphincter muscle
  • musculus sphincter pupillae
  • sphincter muscle of pupil
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, circular fibers, pupillary sphincter muscle, m. sphincter pupillae, spincter pupillae, iris sphincter, iris constrictor, 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]