Through which structure does the olfactory nerve exit the skull?

Through which structure does the olfactory nerve exit the skull?

• A. Optic canal
• B. Jugular foramen
• C. Internal auditory meatus
• D. Cribriform plate of the ethmoid bone

Answer: (D)

Smell information travels from receptor cells in the nasal mucosa into the brain via the first cranial nerve, which exits the skull through the cribriform plate of the ethmoid bone. The cribriform plate is a sieve-like structure with tiny openings (cribriform foramina) that allow the nerve fibers to pass from the nasal cavity to the olfactory bulb, where they synapse and begin processing scent signals. Other openings in the skull are used by different nerves or vessels—such as the optic canal for the optic nerve, the jugular foramen for IX–XI nerves and the jugular vein, and the internal auditory meatus for the facial and vestibulocochlear nerves—so those options don’t apply to the olfactory nerve.

Smell information travels from receptor cells in the nasal mucosa into the brain via the first cranial nerve, which exits the skull through the cribriform plate of the ethmoid bone. The cribriform plate is a sieve-like structure with tiny openings (cribriform foramina) that allow the nerve fibers to pass from the nasal cavity to the olfactory bulb, where they synapse and begin processing scent signals. Other openings in the skull are used by different nerves or vessels—such as the optic canal for the optic nerve, the jugular foramen for IX–XI nerves and the jugular vein, and the internal auditory meatus for the facial and vestibulocochlear nerves—so those options don’t apply to the olfactory nerve.