Cranial Nerves Symptoms From Damage

CN I

Anosmia (loss of smell)

CN II

Blindness/visual field abnormalities

CN III

Ptosis (drooping of upper eyelid), paralysis of 5/7 eye muscles, inability to constrict pupils

CN IV

Paralysis of the superior oblique, causing the inability to look inferiorly and adducted

CN V1

Loss of sensation to the skin of the forehead, bridge of the nose, eyelid, and anterior scalp

CN V2

Loss of sensation to the skin of the cheeks

CN V3

Loss of sensation to the skin of the jawline; loss of sensation to the anterior 2/3 of the tongue; loss of muscles of mastication to work properly.

CN VI

Paralysis of the Lateral Rectus, causing the inability to abduct the eye

CN VII

Loss of taste for anterior 2/3 of tongue, facial muscle paralysis, dry eyes and mouth

CN VIII

Loss of hearing and balance

CN IX

Loss of taste and general sensation to posterior 1/3 of tongue, loss of sensation to soft palate, and dry mouth

CN X

Soft palate deviation, hoarseness or loss of voice, reduced gastrointestinal mobility

CN XI

Paralysis of sternocleidomastoid and trapezius muscles, causing inability to elevate shoulder and contralaterally rotate the head and neck

CN XII

Paralysis of Ipsilateral muscles of the tongue, causing deviation towards the affected side