Facial nn

Question 1

facial nn path

Answer 1

emerges from the pons and into int auditory canal where it gives off two branches (greater petrosal and chorda tympani) before emerging at the stylomastoid process and branching

Question 2

facial nn components, cell body locations?

Answer 2

somatic motor (pons), special sensory(genticulate ganglion) and visceral motor (presynaptic: pons, post synaptic: pterygopalatine and submandibular ganglia)

Question 3

facial nn branches

Answer 3

greater petrosal and chorda tympani both formed intracranially (greater at the geniculum)
once nn exits at stylomastoid foramen: temporal, posterior auricular, zygomatic, buccal, marginal mandibular, and cervical

Question 4

great petrosal nn

Answer 4

parasympathetic fibers
branches off CN VII at the geniculate ganglion intracranially and merges with the deep petrosal nn (sym) to go to the pterygopalatine ganglion
provides parasym to lacrimal gland and glands of the nose and palate

Question 5

chorda tympani

Answer 5

provides ant 2/3 of tongue taste

branches from CN 7 intracranially

Question 6

label the following image

Answer 6

Question 7

greater petrosal nn (deep too)

Answer 7

branches at geniculum
carries preganglionic axons for parasym to the pterygopalatone gang
joins with deep petrosal nn (postgang sympathetics)
these combined= nn of the pterygoid canal
provides ANS to lacrimal gland, glands of nose

Question 8

where do the greater and deep petrosal nn join

Answer 8

foramen lacerum>form the nn of the pterygoid canal that then provides branches to the pterygopalatine ganglion