Cranial Nerve 7. Flashcards
What type(s) of fibers does the superior salivary nucleus contribute?
Preganglionic Parasympathetic
What type of fibers does the chorda tympani carry
Preganglionic Parasympathetic fibers AND taste fibers
What 3 nerves come off the geniculate ganglion?
- Greater Petrosal Nerve
- N. To the Stapedius
- Chorda Tympani
What structures does the greater petrosal nerve stimulate?
- Lacrimal gland
- Nasal gland
- Palatal gland
What are the branches the break off the posterior Auricular nerve?
- Occipital branch
2. Auricular branch
Posterior Auricular travels what way to the ear?
Posterior
Axons in the motor nucleus of the facial nerve travel through what ganglion?
Geniculate ganglion
Two roots are present at the apparent origin.
What are they?
- Motor root
2. Intermediate nerve
What branch of C.N. 7 motor division travels inferiorly?
Cervical branch
Does C.N. 7 carry motor, sensory, or mixed fibers?
Mixed
N. To the Stapedius supplies what muscle?
Stapedius
What 2 other branches does the temporal branch of C.N7 combine with to supply other muscles?
- Zygomaticotemporal nerve (V2)
2. Auriculotemporal branch (V3)
Taste information travels through _______ to terminate in________
Geniculate ganglion
Solitary Nucleus
What type of fibers does the greater petrosal nerve carry
Preganglionic Parasympathetic fibers
When the motor root and intermediate nerve leave the CNS they enter_____________ located in the _________________________
Internal acoustic meatus
Petrous part of the temporal bone
What nucleus does the motor nucleus travel around when exiting the CNS?
Abducens nucleus
What does the cervical branch supply?
Platysma
Motor nucleus receives information from what other structure?
Reticular formation
In what nucleus do sensory fibers terminate?
Solitary nucleus
What are the branches that come off the two trunks from the parotid plexus?
1.Temporal branches
2.Zygomatic branches
3.Buccal branches
4.Marginal mandibular branch
5.Cervical branch
(Three Zebras Bite My Mother’s Cantaloupes)
What does the stylohyoid branch supply?
Stylohyoid muscle
General sensation from what structures are carried to the geniculate ganglion?
- External ear
2. Lateral tympanic membrane
How many branches come off the facial nerve btwn the stylomastoid foramen.
What are they?
3
- Digastric branch
- Stylohyoid branch
- Posterior Auricular nerve
Zygomatic branches help supply what?
Orbicularis oris
True or False
Motor nucleus only recieves information from one cerebral hemisphere
False
It does receive from both
Where are the cell bodies for the sensory neurons located?
Geniculate Ganglion
True or False
The motor and intermediate roots never join together
False
They form one branch
What type of fibers does the intermediate nerve carry?
Sensory and Parasympathetic fibers
What is the pathway for the chorda tympani?
- Goes across the tympanic cavity
- Leaves the temporal bone thru pterygotympanic fissure
- Then combines with lingual nerve
What is the other name for the greater petrosal nerve?
Superficial petrosal nerve
In the motor nucleus of the facial nerve, the nucleus supplying muscles in the_________ part of the face _______ information only from __________ cortex
Inferior
Receives
Contralateral
What is the pathway for the greater petrosal N.?
- Comes off geniculate ganglion
- Travels anteriorward through hiatus of greater petrosal nerve
- Re-enters petrous part of the temporal bone thru the foremen lacerum
- Travels in the pterygoid canal
- Thus joining the pterygopalatine ganglion
True or False
Sensory fibers terminate in the upper part of the solitary nucleus
True
True or False
Motor nucleus first travels anteriorly when exiting the CNS?
False
Posteriorly
What does the digastric branch supply?
Posterior belly of the digastric muscle
The Parotid plexus gives rise to what two trunks?
- Temporofacial
2. Cervicofacial
Chorda tympani combines with what branch of C.N 5
Mandibular division
What is another name for the motor root
Facial nerve proper
What type of motor neurons are carried in the motor nucleus of the facial nerve?
LOWER MOTOR NEURONS
Remember this ALWAYS!😉
The nerve that enter the parotid gland forms what?
Parotid plexus
Preganglionic parasympathetic fibers from the superior salivary nucleus synapse in what 2 ganglions?
Either-Or
- Pterygopalatine ganglion
- Submandibular ganglion
When temporal branch of C.N.7 combines with the other two nerves what muscles do they supply?
- Obicularis oculi
- Corruator supercilii
- Frontal belly of the occipitofrontalis
What does the 5 branches from the parotid plexus in the C.N 7 nerve supply?
The muscles for facial expression
Geniculate ganglion general information neurons send axons to what nucleus?
Solitary nucleus
The new single trunk formed from the two roots enters_________
Bends____________ forming the ______________?
Facial canal
Posteriorly
External genu
True or False
Motor nucleus is a secondary nucleus of origin.
False
Primary
What nerve combines with the trigeminal nerve?
Chorda tympani
What is the apparent origin for the facial nerve?
Cerrebellopontine sulcus
Postganglionic fibers supply what gland(s)?
- Lacrimal
- Submandibular
- Sublingual
- (Small glands in oral and nasal cavities)
What nerve only contains motor fibers to leave the facial nerve in the facial canal?
N. To the Stapedius
What is the other name for C.N. 7?
Nerve of Facial Expression
What are the clinical considerations for the C.N. 7?
- Bell’s Palsy- face droop
2. Superficial Parotidectomy
Geniculate ganglion is located where?
In the external genu of the facial nerve
What does the temporal branch ALONE supply?
1.Intrinsic Auricular muscles
2&3.Superior and Anterior Auricular muscles-extrinsic muscles
Specific fibers that convey taste from _____ part of tongue are carried in the ________
Anterior
Chords tympani
What does the buccal branches supply?
- Buccinator
- Orbicularis oris
- Levator Anguli oris
What is the name of the primary nucleus of origin?
Motor nucleus of the facial nerve
What is the name for C.N.7?
Facial nerve
True or False
The stapedius is the smallest muscle in the body.
True
What type of fibers from C.N. 7 leave through the styloidmastoid foramen?
Motor or somatosensory fibers
What does the marginal mandibular branch supply?
Risorious and muscles of chin and lower lip
