(anatomy) Any of several arteries that arise from the ophthalmic artery or its branches and supply various parts of the eye.

(anatomy) Any of the vascular folds on the inner surface of the ciliary body that produce the aqueous humor and between which pass the zonule of Zinn joining the ciliary muscle to the lens.

(neuroanatomy) Any of two or three nerves that are given off by the nasociliary nerve as it crosses the optic nerve, pass through the posterior part of the sclera, and run forward between the sclera and the choroid to be distributed to the iris and cornea.

(neuroanatomy) Any of 6 to 10 delicate nerve filaments of parasympathetic, sympathetic, and general sensory function that arise in the ciliary ganglion and innervate the smooth muscles and tunics of the eye.

(anatomy) Either of usually two arteries of which one arises from the ophthalmic artery on each side of the optic nerve, passes forward along the optic nerve accompanying the short posterior ciliary arteries, pierces the sclera passing forward on the same side of the eyeball between the sclera and the choroid to the ciliary muscle, and at the junction of the ciliary process and the iris divides into upper and lower branches which anastomose with the branches of the contralateral artery to form a ring of arteries around the iris.

(anatomy) Any of 6 to 10 arteries that arise from the ophthalmic artery or its branches, pass to the posterior part of the eyeball while surrounding the optic nerve, and enter or divide into branches entering the sclera to supply the choroid and the ciliary processes.