Ciliary Arteries

	Ciliary Arteries The ciliary arteries are divisible into three groups, the long posterior, short posterior, and the anterior. * The short posterior ciliary arteries from six to twelve in number, arise from the ophthalmic artery as it crosses the optic nerve. * The long posterior ciliary arteries, two for each eye, pierce the posterior part of the sclera at some little distance from the optic nerve. * The anterior ciliary arteries The anterior ciliary arteries are seven arteries in each eye-socket that arise from muscular branches of the ophthalmic artery and supply the conjunctiva, sclera, rectus muscles, and the ciliary body. The arteries end by anastomosing with branc ... are derived from the muscular branches of the ophthalmic artery. Additional images File:Gray514.png, The ophthalmic artery and its branches File:Gray878.png, Iris, front view. File:Gray880.png, The terminal portion of the optic nerve and its entrance into the eyeball, in horizontal section. References Arteries ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Short Posterior Ciliary Arteries The short posterior ciliary arteries are a number of branches of the ophthalmic artery. They pass forward with the optic nerve to reach the eyeball, piercing the sclera around the entry of the optic nerve into the eyeball. Anatomy The number of short posterior ciliary arteries varies between individuals; one or more short posterior ciliary arteries initially branch off the ophthalmic artery, subsequently dividing to form up to 20 short posterior ciliary arteries. Origin The short posterior ciliary arteries branch off the ophthalmic artery as it crosses the optic nerve medially. Course and relations About 7 short posterior ciliary arteries accompany the optic nerve, passing anterior-ward to reach the posterior part of the eyeball, where they divide into 15-20 branches and pierce the sclera around the entrance of the optic nerve. Distribution The short posterior ciliary arteries contribute arterial supply to the choroid, ciliary processes, optic disc, the outer retina, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ophthalmic Artery The ophthalmic artery (OA) is an artery of the head. It is the first branch of the internal carotid artery distal to the cavernous sinus. Branches of the ophthalmic artery supply all the structures in the orbit around the eye, as well as some structures in the nose, face, and meninges. Occlusion of the ophthalmic artery or its branches can produce sight-threatening conditions. Structure The ophthalmic artery emerges from the internal carotid artery. This is usually just after the internal carotid artery emerges from the cavernous sinus. In some cases, the ophthalmic artery branches just before the internal carotid exits the carotid sinus. The ophthalmic artery emerges along the medial side of the anterior clinoid process. It runs anteriorly, passing through the optic canal inferolaterally to the optic nerve. It can also pass superiorly to the optic nerve in a minority of cases. In the posterior third of the cone of the orbit, the ophthalmic artery turns sharply and med ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Optic Nerve In neuroanatomy, the optic nerve, also known as the second cranial nerve, cranial nerve II, or simply CN II, is a paired cranial nerve that transmits visual system, visual information from the retina to the brain. In humans, the optic nerve is derived from optic stalks during the seventh week of development and is composed of retinal ganglion cell axons and glial cells; it extends from the optic disc to the optic chiasma and continues as the optic tract to the lateral geniculate nucleus, Pretectal area, pretectal nuclei, and superior colliculus. Structure The optic nerve has been classified as the second of twelve paired cranial nerves, but it is technically a myelinated tract of the central nervous system, rather than a classical nerve of the peripheral nervous system because it is derived from an out-pouching of the diencephalon (optic stalks) during embryonic development. As a consequence, the fibers of the optic nerve are covered with myelin produced by oligodendrocytes, r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Long Posterior Ciliary Arteries The long posterior ciliary arteries are arteries of the orbit. There are long posterior ciliary arteries two on each side of the body. They are branches of the ophthalmic artery. They pass forward within the eye to reach the ciliary body where they ramify and anastomose with the anterior ciliary arteries, thus forming the major arterial circle of the iris.The long posterior ciliary arteries contribute arterial supply to the choroid, ciliary body, and iris. Anatomy There are two long ciliary arteries. They are branches of the ophthalmic artery. Course and relations The long posterior ciliary arteries first run near the optic nerve before piercing the posterior sclera near the optic nerve. They pass anterior-ward - one along each side of the eyeball - between the sclera and choroid to reach the ciliary muscle where they divide into two branches which go on to form the major arterial circle of the iris. Anastomoses Non-terminal branches of the long posterior ciliary arteries ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Anterior Ciliary Arteries The anterior ciliary arteries are seven arteries in each eye-socket that arise from muscular branches of the ophthalmic artery and supply the conjunctiva, sclera, rectus muscles, and the ciliary body. The arteries end by anastomosing with branches of the long posterior ciliary arteries to form the circulus arteriosus major. Anatomy There are seven anterior ciliary arteries on each side of the body; two anterior ciliary arteries are associated with the superior, the medial, and the inferior rectus muscles, whereas the lateral rectus muscle is associated with only a single anterior ciliary artery. Origin The anterior ciliary arteries arise from muscular branches of the ophthalmic artery supplying the rectus muscles of the eye. Course and relations The anterior ciliary arteries exit the muscles near the muscles' insertions, passing anterior-ward alongside the rectus muscles' tendons before turning inward to perforate the sclera near the corneal limbus to reach the ci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]