Perpendicular plate - Lamina perpendicularis
The perpendicular plate is the the vertical part of palatine bone. It is thin, of an oblong form, and presents two surfaces and four borders.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
General Anatomy > Bones; Skeletal system > Axial skeleton > Cranium > Palatine bone > Perpendicular plate