Cranial Nerve I

Olfaction is the sense of smell. Although lower animals have a more highly developed olfactory system, this chemical sense persists in humans. The olfactory system originates in the roof of the nasal cavity with the olfactory epithelium, which is a collection of olfactory receptor cells. The axons of these cells are known collectively as the olfactory nerve. Ascending through the cribriform plate of the ethmoid bone, the olfactory nerve terminates in the olfactory bulb at the base of the frontal lobe. From there the olfactory tract projects to the olfactory cortex in the medial temporal lobe.

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