Lesion localisation with cranial nerve signs

Question 1

Clinical signs with a lesion in the reticular activating system of brainstem (i.e. CN root lesion at brainstem rather than peripheral lesion)

Answer 1

• depression in addition to CN deficits

Question 2

Clinical signs with a lesion in cranial nerves IX-XII

Answer 2

• motor deficits to the tongue and swallowing abnormalities
• neck/shoulder muscle abnormalities

Question 3

Clinical signs with a lesion in cranial nerves V-VIII

Answer 3

• sensory and motor deficits of the face
• vestibular abnormalities

Question 4

Clinical signs with a lesion in cranial nerves I-IV

Answer 4

• blindness and abnormalities of ocular movement and positioning
• abnormalities of smell (hard to asses)