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Summary The Olfactory Nerve (CN I)
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This is a summary of the anatomy and functions associated with the Olfactory Nerve (CN I)
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The Olfactory Nerve (CN I) The olfactory nerve is associated with the special sense of smell
The anatomy of the olfactory system consists of the olfactory epithelium, the
olfactory nerves, olfactory bulbs and the olfactory tracts, with the
associated cerebral cortex and subcortical structures
Olfaction is a chemical sense, so a stimulus must be in solution before it can
activate the smell receptors
To ensure this, the nasal mucosa of the nasal cavity secretes mucus
The axons of the olfactory nerve are SVA fibres (special visceral afferent)
This is a superior view of the skull with
the calvarium removed
It shows the position of the cribiform
plate, where the filaments of the
olfactory nerve pierce the skull to
project into the nasal cavity
The olfactory receptor neurons are
located within the superior nasal
mucosa and on the medial wall of the
superior nasal concha
The nasal mucosa is bound to the
supporting bone and cartilage
The inferior 2/3 of the nasal mucosa
are classified as being in the
respiratory zone, while the upper 1/3 is
in the olfactory zone
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