Ethmoid bone Flashcards
ethmoid bone
o forms anteromedial floor of cranium and part of orbital wall
o cribriform plate
superior portion of ethmoid bone
• contains cribriform foramina – tiny sieve-like perforations
• allows passage of olfactory (smell) sensory nerve endings to enter from the nasal cavity and coalesce to form the olfactory bulbs
o crista galli
prominent ridge separating right and left sides of cribriform plate
• attachment point for dura mater = thick connective tissue and outermost of the meninges
o nasal conchae (superior and middle)
= bony shelves that increase surface area in nasal cavity
• turbulent air movement facilitates moistening, warming and removal of particles in inhaled air, facilitates exposure to olfactory endings
o perpendicular plate
forms part of nasal septum
