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Recommended video: Eyeball [25:37]
Structure of the eyeball seen in a transverse section.

The iris is the circular coloured part of the eye. It is part of the vascular layer of the eye - the other two components are the choroid and the ciliary body.

The central opening of the iris is the pupil. Within the iris there are smooth muscle fibers that control the size of the pupil.

The smooth muscle fibers within the iris form the sphincter pupillae muscle, which constricts the pupillary opening, and the dilator pupillae muscle, which dilates the pupil

Terminology English and latin: Iris
Function Controls the size of the pupils

Learn everything about the anatomy of the eyeball with the following study unit!

Iris: want to learn more about it?

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