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Chapter: Medicine and surgery: Nervous system

Olfactory nerve (I) lesion - Disorders of cranial nerves

The olfactory receptors lie in the olfactory epithelium in the upper part of the superior turbinate and the nasal septum.

Disorders of cranial nerves

 

Olfactory nerve (I) lesion

 

Anatomy

 

The olfactory receptors lie in the olfactory epithelium in the upper part of the superior turbinate and the nasal septum. The axons form bundles which pass through the cribiform plate (ethmoid bone) to the olfactory bulb. The bundles are wrapped in meninges. The olfactory bulb neurones project through the olfactory tract to the frontal cerebral hemispheres, the medial temporal lobe and the basal ganglia.

 

Function

 

Smell

 

Specific causes

 

Trauma, frontal lobe tumour, meningitis.


Clinical features

 

Diminished sense of smell and taste (closely linked to smell) although this may be found in elderly patients without olfactory nerve lesions. Test ability of each nostril to detect several common smells.

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Medicine and surgery: Nervous system : Olfactory nerve (I) lesion - Disorders of cranial nerves |

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Medicine and surgery: Nervous system


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