Which bone forms the floor of the anterior cranial fossa and contains the cribriform plate?

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The cribriform plate is a horizontal part of the ethmoid bone, and it forms a portion of the floor of the anterior cranial fossa. It contains numerous tiny foramina through which the olfactory nerve fibers pass from the nasal cavity to the olfactory bulbs. The ethmoid sits between the nasal cavity and the brain, supplying this specific bony contribution to the anterior cranial fossa; the frontal bone contributes to the anterior border, the sphenoid and temporal bones help form the rest of the base, but they do not house the cribriform plate. So, the bone that forms that floor and contains the cribriform plate is the ethmoid bone.