Perpendicular Plate of Ethmoid Bone

Perpendicular Plate of Ethmoid Bone

The structure indicated is the perpendicular plate of the ethmoid bone.

The ethmoid bone is one of the bones in the skull that separates the nasal cavity from the brain. There are three parts of which the ethmoid bone is comprised:

  1. Cribriform plate
  2. Ethmoidal labyrinth (one on either side)
  3. Perpendicular plate

The perpendicular plate of the ethmoid bone extends inferiorly from the base of the cribriform plate and contributes to the median nasal septum. It has the following articulations:

  • Anteriorly: spine of frontal bone
  • Posteriorly: sphenoidal crest
  • Inferiorly: septal cartilage anteriorly, vomer posteriorly

Learn more about the bones of the skull in this tutorial