Facial Nerve Flashcards
What type of fibers are carried by CN VII?
motor and sensory
T/F: CN VII is know as “the great sensory nerve of the face.”
False; it is the “nerve of facial expression.”
What is the primary nucleus of origin for CN VII?
motor nucleus of the facial nerve
What does the superior salivatory nucleus contribute tot the facial nerve?
pregnglionic parasympathetic fibers
Where do sensory fibers carried in the facial nerve terminate?
upper part of the solitary nucleus
What is the other name for the solitary nucleus?
nucleus solitarius
Where are the cell bodies of the sensory neruons found for CN VII?
genniculate ganglion
What is the proper name for the eardrum?
lateral tympanic membrane
Where is general sensation from the external ear and lateral tympanic membrane carried to?
geniculate ganglion
Sensory information delivered to the solitary nucleus come from axons from where?
geniculate ganglion
Other than general sensation, neurons with cell bodies located in the geniculate ganglion also carry what kind of information?
taste
Where do sensory neurons with cell bodies located in the geniculate ganglion terminate?
Solitary nucleus
What part of the tongue do the neurons in the chorda tympani carry info from?
anterior 2/3
What structure divides the tongue into an anterior 2/3 and posterior 1/3?
sulcus terminalis
T/F: axons in the motor nucleus of the facial nerve that travel throught the geniculate ganglion are upper motor neurons.
False; these are lower motor neurons
Which cerebral hemisphere sends information to the motor nucleus of CN VII?
both
What part of the face receives motor info ONLY from the contralateral cortex?
inferior part
T/F: the reticular formation sends info to motor nucleus, of CN VII.
True
Where do preganglionic parasympathetic fibers from the superior salivatory nucleus synapse?
either the pterygopalatine ganglion or the submandibular ganglion.
What kind of fibers from the superior salivatory nucleus synapse in the pterygopalatine ganglion?
preganglionic parasympathetic
Postganglionic fibers in the parasympathetic pathway of CN VII supply several gland. What specific glands were mentioned in class?
lacrimal, submandibular, sublingual and small glands in the oral and nasal cavities.
What is the apparent origin of the Facial nerve?
laterally in the sulcus between the pons and medulla oblongata; near the cerebellopontine recess
Before exiting the CNS, fibers from the motor nucleus of the facial nerve travel where?
posteriorly and arch around the abducens nucleus
What two roots are present at the apparent origin of CN VII
Motor root and intermediate nerve/root
what is another name for the motor root of the facial nerve?
facial nerve proper
What kind of fibers are carried by the intermediate nerve of CN VII?
sensory and parasympathetic
Upon exiting the CNS, both roots of CN VII travel together and enter what opening?
internal acoustic meatus
Where is the internal acoustic meatus located?
the petrous part of the temporal bone
What nerve comes off the geniculate ganglion and travels anteriorward?
the greater petrosal nerve
What opening does he greater petrosal nerve travel through after coming off the geniculate ganglion?
hiatus for the greater petrosal nerve
Where does the greater petrosal nerve reenter the petrous part of the temporal bone?
formen lacerum
What nerver travels through the pterygoid canal to ultimately join the pterygopalatine ganglion?
greater petrosal nerve
What kind of fibers does the greater petrosal nerve carry?
preganglionic parasympathetic fibers
What glands does the greater petrosal nerv stimulate secretions for?
lacrimal, nasal and palatal glands
What is the other accepted name for the greater petrosal nerve?
superior petrosal nerve
What is the second nerve given off of the facial nerve inside the facial canal?
the nerve to stapedius
What nerve innervates the stapedius?
nerve to the stapedius
What nerve contains the only motor fibers that leave the facial nerve in the facial canal?
nerve to stapedius
Where is the stapedius located?
the middle ear
What is the third branch coming off the facial nerve in the facial canal?
chorda tympani
What kind of fibers are carried by the chorda tympani?
preganglionic parasympathetic fibers and taste fibers
What cavity does the chorda tympani traverse?
tympanic cavity
Where does the chorda tympani exit the temporal bone?
pterygopalatine fissure
Whaat nerve does tthe chorda tympani combine with after exiting the temporal bone?
the lingual nerve of the the mandibular division
What kind of fibers associated with the facial nerve exit the stylomastoid foramen?
motor and somatosensory
How many branches come off of the facial nerve between the stylomastoid foramen and the parotid gland?
3
What are the branches that come off of the facial nerve between the stylomastoid foramen and the parotid gland?
digastric branch, stylohyoid branch and posterior auricular nerve
What nerve supplies the posterior belly of the digastric muscle?
the digastric branch of the facial nerve
What nerve innervates the stylohyoid muscle?
stylohyoid branch
In addition to motor fibers, what other fibers are carried by tthe digastric and stylohyoid branches?
proprioceptive fibers
What branch of the facial nerve travels posterior to the ear?
the posterior auricular nerve
What are the two branches of the posterior auricular nerve?
occipital branch and auricular branch
T/F: all autonomic fibers carried in CN VII are given off inside of the facial canal.
True
What are the two trunks that arise from the parotid plexus?
temporofacial and cervicofacial
What are the five branches of the two trunks which arise from the parotid plexus?
Temporal, zygomatic, buccal,marginal mandibular, and cervical branches (ten zebras bit my mother’s cheek)
What is innervated by the parotid plexus?
muscles of facial expression
What nerve of the parotid plexus innervates the intrinsic auricular muscles?
temporal branch
what nerve of the parotid plexus innervates the superior and anterior auricular muscles?
Temporal branch
What nerve(s) innervate the orbicularis oculi, corrugator supercilli, and frontal belly of the occipitofrontalis?
the temporal branch of the parotid plexus in combination with the zygomaticotemporal nerve (V2) and the auriculotemporal branch (V3)
What do the zygomatic branches help supply?
orbicularis oculi
What muscles are innervated by the buccal branches of the parotid plexus?
buccinator, orbicularis oris, and levator anguli oris
If the temporal branch supplies motor innervation to the orbicularis ocul, corrugator supercilii, and frontal belly of occipitofrontalis, what nerves supply the sensory info?
zygomaticotemporal nerve (V2) and auriculotemporal branch (V3)
what muscles are innervated by the marginal mandibular branch of the parotid plexus?
risorius and muscles of the lower lip/chin.
What branch of the parotid plexus may join up with the mentl nerve?
marginal mandibular branch
What does the cervical branch innervate?
platysma
This clinical consideration may appear very similar to a stroke but is localized to only the face. One side of the face will be without expression; unkown cause typically; can last months. What is this called?
Bell’s Palsy
What surgery is particularly dangerous with regard to the parotid plexus?
Superficial parotidectomy
