Final answer:
The olfactory nerve enters the skull through the cribriform plate of the ethmoid bone to connect to the olfactory bulb and then to the brain's olfactory regions.
Step-by-step explanation:
The olfactory nerve enters the skull via the cribriform plate of the ethmoid bone. Specifically, the axons of olfactory neurons travel through olfactory foramina in this plate before they reach the brain. There, they connect to the olfactory bulb on the ventral surface of the frontal lobe. Following this connection, the olfactory axons split to various regions of the brain, with some traveling to the primary olfactory cortex.