ethmoid foramen

eth·moid fo·ra·men

(eth'moyd fōr-ā'mĕn)
Either of two foramina formed by grooves on either edge of the ethmoidal notch of the frontal bone, and completed by similar grooves on the ethmoid bone: anterior ethmoid foramen, located in an anterior position; posterior ethmoid foramen located in a posterior position.
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The anterior ethmoid artery, a branch of the ophthalmic artery, leaves the orbit via the anterior ethmoid foramen, crosses the roof of the anterior ethmoid sinus, and supplies the anterior ethmoid cells and frontal sinus (figure, A).
4) Kirchner et al reported that the distance from the posterior ethmoid foramen to the anterior portion of the optic foramen ranged between 4 and 7 mm in 84% of the skulls they studied.
Endoscopic view of the posterior ethmoid artery

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