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a.1.(Anat.) External to the ethmoid; prefrontal.
References in periodicals archive ?
The ectethmoid bone (Ec, Figure 5) is slender and its dorsal portion (facies nasalis) (Pj1, Figures 5-9) is short laterally and there is no contact with the lacrimal bone.
10) Ectethmoid foramina: The ectethmoid (= orbitonasal) foramina were single, pinched, double, or in a few cases triple.