Tuesday 3 - facial nerve

Question 1

4 main components of the facial nerve

Answer 1

1. Branchial motor (major role): efferent supply to
   ipsilateral muscles of facial expression &
   stapedius (branchial motor)
2. Visceral Motor: Preganglionic parasympathetics
   to lacrimal gland, submandibular & sublingual glands
3. Somatic sensory: afferent supply to ipsilateral
   part of outer ear, nasal cavity and soft palate
4. Visceral (special) sensory: ipsilateral afferent
   supply for taste to the anterior 2/3 of the tongue

Question 2

Facial motor nucleus location?

Answer 2

Ventrolateral caudal pons

Question 3

Upper motor neuron damage of the corticobulbar region causes what

lower motor neuron damage causes what

Answer 3

paralysis of cheek contralaterally

paralysis of cheek and face ipsilaterally

Question 4

Blink reflex:

afferent limb

efferent limb

Answer 4

afferent: opthalmic branch of trigeminal
efferent: facial

Question 5

Jaw jerk reflex:

Afferent limb

Efferent limb

Answer 5

Afferent: mandibular division of trigem

Efferent: same