Cranial Nerves

Question 1

Cranial Nerve V

Answer 1

Trigeminal Nerve (ophthalmic, maxillary, mandibular)
Sensory and motor nerve
Bilaterally innervated

Question 2

Unilateral damage to cranial nerve V will cause:

Answer 2

The jaw to deviate towards the affected side when the mouth is closed

Question 3

Bilateral damage to cranial nerve V may result

Answer 3

In an inability to close mouth and difficulty chewing
Trigeminal neuralgia (sharp pain in the facial area)

Question 4

Cranial Nerve VII

Answer 4

Facial Nerve
Mixed nerve (sensory and motor)
Sensory responsible for taste in anterior 2/3 of tongue
Motor innervate muscles important to facial expressions and speech

Question 5

Cranial Nerve IX

Answer 5

Glossopharyngeal Nerve
Mixed nerve
Sensory: taste posterior 1/3 of tongue; faucial pillars, tonsils, soft palate, pharynx
Motor: stylopharyngues, pharyngeal plexus (upper pharyngeal muscles)

Question 6

Lesions to Cranial Nerve IX

Answer 6

Lesions cause difficulty swallowing, unilateral loss of gag reflex, loss of taste posterior 1/3 tongue

Question 7

Cranial Nerve X

Answer 7

Vagus Nerve
Mixed
Motor: pharynx and larynx
Sensory: lower pharynx, larynx, epiglottis

Question 8

Cranial Nerve XI

Answer 8

Spinal Accessory Nerve
Supplies trapezius and sternocleidomastoid muscles
Innervate muscles for soft palate

Question 9

Cranial Nerve XII

Answer 9

Hypoglossal Nerve
Motor nerve that runs under the tongue
Supplies all intrinsic and extrinsic tongue muscles (except for palatoglossus)