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Abstract: Introduction: The cribiform plate of the ethmoid bone, in the craniofacial region, is an area of great surgical risk. Surgical and accidental traumas and tumoral pathologies are frequent in the interorbital space. Expontaneous cerebrospinal rhinorrhea is observed in the ethmoidal and sphenoidal parts of the nasal roof. Purpose: The aim of this study was to contribute to the knowledge of the ethmoid bone's cribiform plate localization, to prevent surgical risk and avoid cerebrospinal rhinorrhea. Material and Methods: In the direct and radiographic observations of 20 skulls and 10 formalized heads, mensurations were made of distances between the ethmoid bone's cribiform plate (CPE) and the frontal bone's orbital plate (OPF). Conclusion: The direct and radiographic mensuration range of the skulls were 14.0 mm and 14.5 mm of the heads were 15.0 mm and 20.5 mm, respectively. The CPE/OPF distance depends on ethmoidal cells expantion into the orbitonasal spaces but the CPE anatomical localization is very stable.
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