unit 3: facial nerve (CN VII) Flashcards
the primary nucleus of origin of the facial nerve
motor nucleus of facial nerve
nucleus that contributes PREganglionic parasympathetic fibers to the facial nerve
superior salivary
nucleus of termination for facial nerve
upper part of solitary nucleus
sensory cell bodies are found in the
geniculate ganglion
along with taste, sensation from these two areas are carried to the geniculate ganglion, and ultimately to the solitary nucleus
external ear
tympanic membrane
specific neurons with taste info from the anterior tongue are found in
chorda tympani
LMN exit the CNS, travel thru the geniculate ganglion and innervate muscles of
facial expression
while the motor nucleus gets info from both hemispheres & the __ ___, the part supplying the inferior face only gets info from the ____ ___
reticular formation
contralateral cortex
two ganglion that recieve preganglionic para fibers from the superior salivatory nucleus
pterygopalatine
submandibular
these areas receive POSTganglionic parasympathetic fibers
lacrimal, submandibular, sublingual glands
small glands of oral/nasal cavities
apparent origin of facial nerve
sulcus bt pons & MO
-lateral to CN VI, medial to CN VIII
fibers from the motor nucleus travel posteriorly and arch around the ___ ____
abducens nucleus
two roots present at the apparent origin of the facial nerve
motor root intermediate nerve (sensory/para fibers)
after the two roots of the facial nerve exit the CNS, they enter the
internal acoustic meatus (in petrous part of temporal bone)
the two facial roots combine into a trunk that enters the facial canal, bends posteriorly, and forms the _____ ____, which is where the geniculate ganglion is
external genu
- branch of the facial the comes off the geniculate ganglion, thru the hiatus for the greater petrosal nerve, re-enters petrous part of temp bone thru foramen lacerum
- carries PREganglionic para fibers
greater petrosal nerve
greater petrosal nerve, off of facial, travels the pterygoid canal after re-entering, ultimately joins the _______ ganglion, stimulates secretions of these 3 glands
pterygopalatine
lacrimal, nasal, palatal
greater petrosal nerve aka
superficial petrosal
nerve off facial that has only motor fibers leaving the facial nerve in facial canal, supplies stapedius musc of inner ear
nerve to stapedius
nerve off facial that carries PREganglionic para & taste (ant 2/3) fibers, crosses tympanic cavity and leaves thru pterygotympanic fissure
chorda tympani
the chorda tympani crosses tympanic cavity and leaves temporal bone through ____ ___, before combining w. lingual nerve
pterygotympanic fissure
three branches off the facial between the stylomastoid foramen & parotid gland
digastric
stylohyoid
posterior auricular
branch off facial that divides into occipital branch and auricular branch to supply extrinsic & intrinsic ear muscles
posterior auricular
two trunks off of the facial that form that parotid plexus with the five major branches
temporofacial
cervicofacial
muscles supplied by temporal branches in parotid plexus
intrinsic auricular
superior & anterior auricular
muscles that are supplied by the temporal branches in combo with zygomaticotemporal (max) and auriculotemporal (mandib)
orbicularis oculi
corrugator supercilii
frontal belly of occipitofrontalis
the ___ branches helps to supply the orbicularis oculi
zygomatic
muscles supplied by the buccal branches
buccinator
orbicularis ORIS
levator anguli oris
muscles that are usually supplied by the marginal mandibular branch
risorious
muscles of chin & lower lip
the cervical branch supplies the
platysma
- clinical condition involving the facial nerve that resolves on its own bc it is a CN problem
- one side of face cannot move
Bell’s Palsy
removal of parotid gland due to a tumor
superficial parotidectomy
