The lacrimal artery arises close to the optic foramen, and is one of the largest branches derived from the ophthalmic artery: not infrequently it is given off before the artery enters the orbit.
The lacrimal artery arises close to the optic foramen. The lacrimal artery is one of the largest branches. These largest branches are derived from the ophthalmic artery. Infrequently it is given off. The artery enters the orbit.