The olfactory nerves (I cranial nerve)

Special visceral afferent (SVA)


The olfactory nerves are formed by unmyelinated axons (surrounded by olfactory ensheating cells), whose bodies are located in the epithelium that covers the caudal half of the ethmoid labyrinth and the dorsal nasal septum. The axons enter the cranial cavity through the cribriform plate of the ethmoid bone and reach the olfactory bulb (paleocortex) of the cerebrum. The olfactory nerves transmit odor sensations.


The vomeronasal organ is closely related to the sense of smell. It has pheromone receptors to detect odors associated with reproductive functions. The terminal and vomeronasal nerves reach the olfactory bulb.