Olfactory nerve

This sensory nerve arises from olfactory (smell) receptors in the nasal mucosa. Branches pierce the cribriform plate and synapse in the olfactory bulb. The olfactory tract then passes to the olfactory cortex in the anteromedial surface of the temporal lobe.

Anosmia (loss of sense of smell) is caused by head injury and tumours of the olfactory groove (e.g. meningioma, frontal glioma). It is often lost, occasionally permanently, after upper respiratory viral infections and diminished when the nose is blocked.

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