perpendicular plate of ethmoid bone

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per·pen·dic·u·lar plate of eth·moid bone

a thin plate of bone projecting downward from the crista galli of the ethmoid; it forms part of the nasal septum.
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Osteoblastoma of the nasal cavity arising from the perpendicular plate of the ethmoid bone. J Laryngol Otol.
Then the surface area of each of the sixbony components--the perpendicular plate of the ethmoid bone, the vomer, the sphenoid bone, the nasal process of the frontal bone, the nasal bone, and the palatine crest--was measured with a transparent grid calibrated in square millimeters, Then we calculated the contributions that each of these bones made to the total osseous surface area and the contribution that the total bony component made to the total chondro-osseous septal surface area.
Deviations in nasal septae usually involve the cartilage and the perpendicular plate of the ethmoid bone. (6) Sometimes the nasal crest of the palatine bone and the crest of the maxilla are involved, but the vomer is usually not.