Cranial Nerve Components

Question 1

III - oculomotor nerve

Answer 1

2 motor components

• Oculomotor (somatic motor) - to eye muscles
• Edinger-Westphal (visceral motor, parasym pregang) - to pupil (constriction)

Question 2

IV - trochlear nerve

Answer 2

1 motor component

*Trochlear (somatic motor) - to eye muscles

Question 3

V - trigeminal nerve

Answer 3

3 sensory components
*Mesencephalic trigem nuc (somatic sensory) - unconscious jaw proprioception
*Main sensory trigem nuc (somatic sensory) - face touch
*Spinal trigem nuc (somatic sensory) - face pain
1 motor component
*Trigem motor nuc (branchial motor) - jaw muscles

Question 4

VI - abducens nerve

Answer 4

1 motor component

*Abducens (somatic motor) - to eye muscles

Question 5

VII - facial nerve

Answer 5

2 sensory components
*Rostral solitarius (special visceral) - taste ant 2/3 tongue
*Spinal trigeminal (somatic sensory) - skin on ear
2 motor components
*Facial motor nucleus (branchial motor) - face muscles, wraps around abducens with genu
*Superior salivatory (visceral motor, parasym pregang) - salivary glands

Question 6

VIII - vestibulocochlear

Answer 6

2 sensory components

• Vestibular
• Cochlear

Question 7

IX - glossopharyngeal

Answer 7

3 sensory components
*Rostral solitarius (special visceral sensory)- taste from post 1/3 tongue
*Caudal solitarius (visceral sensory) - carotid input
*Spinal trigeminal (somatic sensory) - pain from post 1/3 tongue
2 motor components
*Ambiguus (branchial motor) - larynx/pharynx
*Inf salivatory (visceral motor, parasym pregang) - salivary gland

Question 8

X - vagus

Answer 8

3 sensory components
*Caudal solitarius (visceral sensory) - visceral sensory from organs
*Rostral solitarius (special visceral sensory) - taste from epiglottis
*Spinal trigem nuc (somatic sensory) - pharynx/ear skin pain
2 motor components
*Ambiguus (branchial motor) - larynx/pharynx
*DMX (visceral motor, parasym pregang) - glands/organs in chest

Question 9

XI - spinal accessory

Answer 9

1 motor component

*Spinal accessory nuc - trapezius and sternocleidomastoid muscle

Question 10

XII - hypoglossal

Answer 10

1 motor component

*Hypoglossal nucleus (somatic sensory) - tongue muscles