In mammalian anatomy, the cribriform plate, horizontal lamina or lamina cribrosa (from Latin cribrum, "sieve" + -form) of the ethmoid bone is received into the ethmoidal notch of the frontal bone and roofs in the nasal cavities.
The cribriform plate is narrow with deep grooves supporting the olfactory bulb, and is perforated by olfactory foramina allowing the passage of the olfactory nerves. [Source: Wikipedia 
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