neck and face

Question 1

what nerve innervates muscles of facial expression (and posterior belly of digastric, stylohyoid and stapedius muscles)

Answer 1

facial nerve (CN VII)

Question 2

through what does one branch of the facial nerve exit the cranial cavity via

Answer 2

external acoustic meatus

Question 3

what other nerve passes through the external acoustic meatus

Answer 3

vestibulocochlear nerve (CN VIII)

Question 4

what does the rest of the facial nerve emerge via

Answer 4

stylomastoid foramen at base of skull

Question 5

pathway of facial nerve before branching

Answer 5

exits via stylomastoid foramen -> passes underneath parotid gland -> 5 branches emerge from anterior border of parotid gland

Question 6

which nerve innervates parotid gland

Answer 6

glossopharyngeal (CN IX)

Question 7

5 branches of facial nerve (superior to inferior)

Answer 7

temporal, zygomatic, buccal, mandibular, cervical

Question 8

what muscle does the cervical branch innervate

Answer 8

platisma

Question 9

how to test motor function of facial nerve

Answer 9

ask patient to look up and look for creasing of frontalis muscle