Ethmoid bone

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Status

Done

Parent item

Skull

Consists

• Horizontal plate (cribriform plate)

• Vertical plate in the midline (the perpendicular plate)

• The lateral plate

 

• The cribriform plate forms of 2 parts:
• Horizontal medial lamella
• Vertical lateral lamella: This lateral lamella articulates with the frontal bone.

• The skull base in this region — the ethmoid fovea — is formed:
• Medially — lateral lamella of the cribriform plate — very thin bone (0.2 mm)
• Laterally — frontal bone — thicker bone (0.5 mm)

• The region where the anterior ethmoidal artery pierces the dura medially is the thinnest area in the skull base and is only 0.05 mm in thickness.

Keros classification

• Based on the length of lateral lamella of cribriform plate:
• Type 1: 1–3 mm
• Type 2: 4–7 mm
• Type 3: 8–17 mm