perpendicular plate of ethmoid bone perpendicular plate of ethmoid bone the perpendicular plate of the ethmoid bone (vertical plate) is a thin, flattened lamina, polygonal in form, which descends from the under surface of the cribriform plate, and assists in forming the septum of the nose; it is generally deflected a little to one or other side. the anterior border articulates with the spine of the frontal bone and the crest of the nasal bones. perpendicular plate of ethmoid boneperpendicular plate of ethmoid. shown by removing the right labyrinth.ethmoid bone from behind.detailsidentifierslatinlamina perpendicularis ossis ethmoidalista98a02.1.07.006ta2726fma52891anatomical terms of bone the posterior border articulates by its upper half with the sphenoidal crest, by its lower with the vomer. the inferior border is thicker than the posterior, and serves for the attachment of the septal nasal cartilage of the nose. the surfaces of the plate are smooth, except above, where numerous grooves and canals are seen; these lead from the medial foramina on the cribriform plate and lodge filaments of the olfactory nerves. additional images perpendicular plate of ethmoid.