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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