Ciliary margin of iris
Margo ciliaris iridis
- Related terms: Ciliary margin
Definition
The ciliary margin of iris refers to its outermost peripheral edge, where the iris is attached to the ciliary body. This region, also known as the iris root, represents the thinnest part of the iris.
As the point of attachment, the ciliary margin serves as an anchor, stabilising the iris during dynamic changes in pupil size, including miosis (constriction) and mydriasis (dilation).
Anatomically, the iris root (or the ciliary margin) lies adjacent to the iridocorneal (anterior chamber) angle, which contains the trabecular meshwork. Through this close relationship, the ciliary margin is indirectly involved in aqueous humour drainage dynamics.
References
Standring, S. (Ed.). (2015). Eye (Chapter 42). In Gray's anatomy: The anatomical basis of clinical practice (41st ed., pp. 686-706). Churchill Livingstone.
