Corpus: Major arterial circle of iris
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Synonyms: circulus arteriosus major, major circulus arteriosus of iris, CIA, CIAM
1. Definition
The major arterial circle of the iris is a ring-shaped, arterial vascular plexus at the anterior edge of the ciliary body, formed by anastomoses of the anterior ciliary arteries and the posterior long arteries.
2. Anatomy
Numerous smaller vascular branches branch off from the major arterial circle of the iris in the tissue of the iris and run to the inner edge of the iris (pupil), where they form the smaller minor iris arterial circle. The greater iridoscleral artery supplies the iris, the ciliary body and the anterior choroid.