Facial Nerve Flashcards
The primary nucleus of origin for CN VII?
motor nucleus
What type of information is carried by CN VII?
motor and sensory fibers
what type of information is carried in the superior salivatory nucleus?
preganglionic parasympathetic
What is the special sensory function of CN VII?
taste on anterior 2/3 of tongue
sensory fibers carried in the facial nerve terminate?
upper part of the solitary nucleus
the cell bodies of the sensory neuron are found in
geniculate ganglion
Facial preganglionic parasymapthetic synpase with
Pterygopalatine and submandibular ganglion
General sensation from the external ear and lateral tympanic membrane are carried to____1_____. axons from these neurons carry information to the ____2__.
1- geniculate ganglion
2- solitary nucleus
taste information travels through neurons with cell bodies found in the ___1__ and is terminates in the ____2___.
1-geniculate ganglion
2- solitary nucleus
specific neurons carrying taste from the anterior 2/3 part of the tongue are found in
chorda tympani
the motor nucleus receives information from
both cerebral hemispheres
inferior part of the face receives information only from
the contralateral cortex
the motor nucleus receives information from
reticular formation
Preganglionic parasympathetic fibers from the superior salivatory nucleus synpase in
either the pterygopalatine ganglion or the submandibular ganglion
postganglionic fiber supply
the lacrimal gland, submandibular and sublingual gland as well as small glans in the oral and nasal cavities
the apparent origin of CN VII
junction of Pons and Medulla oblongata, lateral to CN VI and medial to CN VIII
before existing the CNS, fibers from the motor nucleus
first travel posteriorly and arch around the abducens nucleus
What two roots are present at the apparent origin
1-motor root ( facial nerve proper)
2- intermediate nerve (lateral to motor root)
the intermediate nerve carries what type of info
sensory and parasympathetic
where do the two roots go after existing the CNS
internal acoustic meatus
where is the internal acoustic meatus located
the petrous part of the temporal bone
where is the geniculate ganglion located
after the facial canal and bends posteriorly forming the external genu of the facial nerve
what nerve comes off the geniculate ganglion and travels anteriorward
greater petrosal nerve
the greater petrosal nerve re-enters the petrous part of the temporal bone through the
foramen lacerum
traveling in the pterygoid canal the greater petrosal nerve joins up with
pterygopalatine ganglion
what type of information is carried by the greater petrosal nerve
preganglionic parasympathetic
the greater petrosal nerve will stimulate secretion of
lacrimal, nasal, and palatal glands
what is another name for the greater petrosal nerve
superficial petrosal nerve
what is the second nerve given off by the facial nerve in the facial canal
nerve to the stapedius
the nerve to the stapedius only carries
motor fibers
nerve to the stapedius supplies the stapedius muscle, what is the action of this muscle?
stabilize the stapes, provide protection from loud noises primarily our own voice
what is the third branch coming off the facial nerve in the facial canal
the chorda tympani
the chorda tympani carries what type of information
preganglionic parasympathetic fibers and taste fibers
the chorda tympani traverses the tympanic cavity and leave the temporal bone through the
pterygotympanic fissure
what does the chorda tympani combine with
the lingual nerve, a branch of the mandibular division of the trigeminal nerve
what other foramen does the remaining fibers of the facial nerve pass through
stylomastiod foramen
the facial gives off three branches between the stylomastiod foramen and the parotid gland what are they.
the digastric branch, stylohyoid branch, posterior auricular nerve
the digastric branch supplies what
the posterior belly of the digastric muscle
the stylohyoid branch supplies the
stylohyoid muscle
the posterior auricular nerve has two branch what are they
the occipital branch, auricular branch
the occipital branch supplies the
occipital muscle and is the larger one
the auricular branch supplies
the posterior auricular muscles, and the intrinsic muscles of the outer part of the ear
once the facial nerve enters the parotid gland it forms the parotid plexus and what two trunks
temporofacial, cervicofacial
what are the five branches given off by the facial nerve after the two trunks
temporal branch, zygomatic branch, buccal branch, marginal mandibular branch, cervical branch
temporal branch supply what
intrinsic auricular muscles, superior and anterior auricular muscles
what branches come together to supply the orbicularis oculi, corrugator supercilii, and frontal belly of the occipitofrontalis
temporal branches, auriculotemporal (V3), and zygomaticotemporal nerve (V2)
what supplies the orbicularis oculi?
zygomatic branched of the parotid plexus
Buccal branches supply what muscles
buccinator, orbicularis oris and levator anguli oris
these branch supplies the Risorius, and muscles of the chin and lower lip; it may join with the mental nerve of (V3)
marginal mandibular branch
what travels inferiorly to supply the platysma
cervical branch
unilateral paralysis of the facial nerve, can develop overnight and resolve in 3wks 12-18 mo for a full recovery
Bell’s Palsy
removal of the parotid gland, making the facial n. vulnerable; usually due to a tumor
superficial parotidectomy
