Arteries of the Iris, Anterior View

Description

Centered on the anterior surface of the globe, the iris vasculature is rendered as fine arterioles converging into the major arterial circle at the iris root and the minor arterial circle nearer the collarette. Branches course radially within the iris stroma from the peripheral circle toward the pupillary margin, with a dense capillary arcade surrounding the pupil. Surrounding facial and orbital vessels frame the field, including arterial trunks and companion veins along the medial canthus and lateral orbital rim, set against the bony orbit of the skull. Understanding these arterial circles matters when you are teaching or planning interventions that threaten anterior segment perfusion. During anterior uveitis, iris hyperemia and stromal edema relate directly to this radial arterial pattern, and neovascularization of the iris (rubeosis iridis) often begins at the pupillary margin where the minor arterial circle and peripupillary arcade are concentrated. Surgeons also reference the iris root and its vascular ring when considering where bleeding is most likely during procedures such as iridectomy, peripheral iridotomy, and intraocular lens manipulation in a shallow anterior chamber. Small vessels, big consequences. Use this plate in ophthalmology and neuroanatomy curricula to connect the ocular diaphragm to its blood supply, or in medical publishing to illustrate anterior segment circulation alongside clinical entities like hyphema, rubeosis, and uveitis. It also supports patient-facing materials on glaucoma laser peripheral iridotomy when a clear depiction of the iris root and adjacent vascularity is needed. Anatomical accuracy verified by SciePro's Medical Advisory Board.