https://mts.intechopen.com/articles/show/title/posterior-ethmoidal-artery-surgical-anatomy-and-variationsThe posterior ethmoidal artery is a collateral of the ophthalmic artery and participates in the vascularization of the nasal cavities. It is an important landmark in endonasal surgery with complex orbital contents relationships. We recognize many anatomical and functional varieties. This cha…