Wiktionary
cribriform plate
n. (context anatomy English) In the human skull, a sieve-like region of the ethmoid bone (which separates the nasal cavity from the brain).
Wikipedia
Cribriform plate
The cribriform plate of the ethmoid bone (horizontal lamina or lamina cribrosa) is received into the ethmoidal notch of the frontal bone and roofs in the nasal cavities.