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ETHMOID BONE - ANATOMICAL FEATURES

• cribriform plate = horizontal plate = lamina cribrosa = horizontal lamina
  

• crista galli
  

• ala
  

• contents

• air sinus
  

• groove for olfactory nerves to roof of  nasal cavity
• foramina for olfactory nerves to upper part of nasal septum
• foramina for olfactory nerves to superior nasal concha
• fissure for process of dura mater
• notch/foramen for nasociliary nerve
• groove for nasociliary nerve
  

• ethmoidal labyrinth = lateral mass
  

• lateral plate
  

• medial plate
  

• opening for ethmoidal cells
  

• contents
  

• ethmoidal cells
  

• anterior
• middle
• posterior
  

• superior surface = upper surface

• ethmoidal cells
• groove for anterior ethmoidal canal
• groove for posterior ethmoidal canal
  

• posterior surface

• ethmoidal cells

• lateral surface = orbital plate

• lamina papyracea = os planum
• ethmoidal cells
• uncinate process
  

• medial surface

• lamella
  

• middle nasal concha

• grooves for branches of olfactory nerves to mucous membrane covering superior nasal concha

• superior meatus
  

• opening to posterior ethmoidal cells

• superior nasal concha

• middle nasal concha
  

• opening to middle ethmoidal cells
• infundibulum
  

• perpendicular plate = lamina perpendicularis = vertical plate

• anterior border
• posterior border
• inferior border
• grooves and canals for filaments of olfactory nerves
  

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