Posterior ethmoidal artery, also known as the posterior ethmoid artery, is a branch of the ophthalmic artery. It is smaller than the anterior ethmoidal artery and supplies the nasal septum and posterior ethmoidal cells.
Posterior ethmoidal artery originates from the ophthalmic artery in the orbit. It passes between the upper border of the medial rectus muscle and superior oblique muscle to enter the posterior ethmoidal canal.
It then exits into the nasal cavity where it supplies the posterior ethmoidal cells and the nasal septum.
It ends by anastomosing with the sphenopalatine artery.
There is often a meningeal branch of the posterior ethmoidal artery that supplies the dura mater.