The Ophthalmic artery arises from the clinoid portion of the internal carotid artery, and travels with the optic nerve through the optic canal to access the orbit. The branches of the artery may be divided into an orbital group, distributing to the orbit and surrounding parts, and an ocular group, to the muscles and bulb of the eye.
The opthalmic artery gives rise to the following: The contents of the orbit (central artery of the retina, posterior ciliary) and contents beyond the orbit (supratrochlear, supraorbital, dorsal nasal, lacrimal, anterior and posterior ethmoidal). The arteries which extend beyond the orbit anastomose freely with branches of the external carotid artery. The lacrimal artery commonly anastomoses with the middles meningeal artery, and may be derived from it.