Corpus: Perpendicular plate

A lamina perpendicularis is a vertical, thin bone lamella or bone plate. It occurs on two skull bones:

• The lamina perpendicularis ossis ethmoidalis is a polygonal bone lamella that originates from the caudal side of the lamina cribrosa of the ethmoid bone (Os ethmoidale). It forms part of the nasal septum.
• The lamina perpendicularis ossis palatini is a thin, vertical bone plate that adjoins the maxilla at the front and the wing process of the sphenoid bone at the back. It is involved in the construction of the lateral nasal wall. It is part of the viscerocranium (facial skull).

For details see: Os ethmoidale, Os palatinum