The olfactory nerve supplies nerve endings to the superior nasal concha and upper one third of the nasal septum. The olfactory nerve is not routinely tested. However, in any patient with a suspected frontal lobe disorder, the olfactory nerve should be evaluated.
Table 21-1 Cranial Nerves Cranial Nerve
IV: Trochlear V: Trigeminal
VI: Abducens VII: Facial
XI: Spinal accessory
Eye movements; papillary constriction; accommodation
General sensation of face, scalp, and teeth; chewing movements
Taste; general sensation of palate and external ear; lacrimal gland and submandibular and sublingual gland secretion; facial expression
Taste; general sensation of pharynx and ear; elevation of palate; parotid gland secretion
Taste; general sensation of pharynx, larynx, and ear; swallowing; phonation; parasympathetic innervation to heart and abdominal viscera
Phonation; head, neck, and shoulder movements
Clinical Findings with Lesion
Diplopia; ptosis; mydriasis; loss of accommodation
''Numbness'' of face; weakness of jaw muscles
Loss of taste on anterior two thirds of tongue; dry mouth; loss of lacrimation; paralysis of facial muscles
Loss of taste on posterior one third of tongue; anesthesia of pharynx; partially dry mouth
Dysphagia; hoarseness; palatal paralysis
Hoarseness; weakness of head, neck, and shoulder muscles
Weakness and wasting of tongue
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