sphincter pupillae

A sphincter muscle that is part of the iris. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the sphincter pupillae is

A sphincter muscle that is part of the iris. The atlas records it as a muscle at the organ scale in the human body.

Where the sphincter pupillae is

It sits in the head, within the muscular and sensory systems. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What the sphincter pupillae connects to

The atlas records 9 typed relationships for it, across 6 kinds of connection. part of iris.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the sphincter pupillae. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as M. sphincter pupillae, iris sphincter muscle, musculus sphincter pupillae, sphincter muscle of pupil, circular fibers and constrictor pupillae, and 10 more. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001607, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

Questions

Where is the sphincter pupillae?

It sits in the head, within the muscular and sensory systems. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What does the sphincter pupillae connect to?

Part of: iris.

Is the sphincter pupillae the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.