iris

The adjustable membrane, composed of the stroma and pigmented epithelium, located just in front of the crystalline lens within the eye. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the iris is

The adjustable membrane, composed of the stroma and pigmented epithelium, located just in front of the crystalline lens within the eye. The atlas records it as a tissue at the tissue scale in the human body.

Where the iris is

It sits in the head, within the sensory system. Positioned deliberately as part of this species body plan.

What the iris connects to

The atlas records 21 typed relationships for it, across 8 kinds of connection. part of anterior segment of eyeball, material anatomical entity and uvea.

Supply and innervation

Innervation: long ciliary nerve and short ciliary nerve.

Also called

Also recorded as anterior uvea, irides and irises. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001769, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: anterior segment of eyeball, material anatomical entity and uvea.
• A kind of: anatomical structure.
• contains: iris epithelium, iris smooth muscle, iris stroma, muscle of iris, pupil and pupillary membrane, and 1 more.
• contributes to morphology of: iris epithelium, iris stroma and pupil.
• inserts into: dilatator pupillae and sphincter pupillae.
• originates from: dilatator pupillae and sphincter pupillae.
• Innervated by: long ciliary nerve and short ciliary nerve.
• Develops from: optic vesicle.

Questions

Where is the iris?

It sits in the head, within the sensory system. Positioned deliberately as part of this species body plan.

What does the iris connect to?

Part of: anterior segment of eyeball, material anatomical entity and uvea.

Is the iris 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.