Care is taken to raise the flaps down to the maxillary crest and extend them back to the bony-cartilagenous junction of the perpendicular plate
of the ethmoid, vomer, and quandrangular cartilage (figure 2).
The endoscope was then advanced under fluoroscopic guidance until the tip of the scope was at the level of the foreign body, which was located at the posterior aspect of the perpendicular plate.
In our case, the BB had ricocheted off the cement floor, struck the anterior right nasal septum, passed transseptally into the contralateral nasal cavity, remained in the submucoperichondrial plane of the left septum, and eventually migrated posteriorly to the level of the perpendicular plate.
3) Shearing forces may cause fractures of the cribiform plate at its junction with the perpendicular plate
of the ethmoid.
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.
2] A mucosal incision would expose the sphenopalatine neurovascular bundle at the upper end of the perpendicular plate
of the palatine bone.