5. CN IX, X and XII Flashcards
CN IX Glossopharyngeal Nerve
Rootlets of CN IX emerge from the medulla between the ____ and the ____
The nerve exits the cranial cavity through the ____
olive
inferior cerebellar peduncle
jugular foramen
• Preganglionic parasympathetics (GVE)
to ____
• Special sensory fibers (SVA) from ____
• GVA fibers
from ____ and ____
• SVE fibers
to ____
• General sensory fibers (GSA) from Mucosa of: • \_\_\_\_ • Auditory tube • \_\_\_\_ • Oropharynx • \_\_\_\_ • Soft palate Skin of \_\_\_\_ and \_\_\_\_
otic ganglion root (posterior 1/3) of tongue carotid body carotid sinus stylopharyngeus
tmpanic cavity root of tongue fauces auricle tympanic membrane
AFFERENTS
Cell bodies of all sensory neurons in this nerve, (GSA, GVA, SVA) are located in the
____ and ____
of CN IX located just above and below the
____
superior
inferior ganglia
jugular foramen
The central processes of the pseudounipolar sensory neurons in the two ganglia project
as follows:
SVA fibers project to the ____
GVA fibers project to the ____
GSA fibers project to the ____
solitary nucleus (rostral) solitary nucleus (caudal) spinal trigeminal nucleus
EFFERENTS
The lower motor SVE neuron cell bodies are found in the ____ of the medulla
Preganglionic paraympathetic neurons (GVE) are located in the
____ of the medulla
nucleus ambiguus
inferior salivatory nucleus
Before descending into the deep neck by coursing posterior
to the styloid process, CN IX gives off the
____ and ____ nerves
- tympanic nerve
- carotid sinus nerve
tympanic
carotid sinus
Tympanic Canaliculus
The TYMPANIC NERVE immediately re-enters the temporal bone via the ____ …and ramifies to form the ____ in the tympanic
cavity
tympanic canaliculus
tympanic plexus
AFFERENT branches of the tympanic plexus innervate mucosa lining the following: \_\_\_\_ Auditory tube \_\_\_\_
These nerves mediate the pain of ____ (middle ear infection)
tympanic cavity
mastoid air cells
otitis media
The Lesser Petrosal
Nerve courses across the ____ and usually exits ____
middle cranial fossa
foramen ovale
The
LESSER PETROSAL NERVE carries ____ parasympathetics to the
____
preganglionic
otic ganglion
CN IX
BRANCHING AND NOTES!
YA
FREY’S SYNDROME -
____
____ - sympathetic
* Incision performed on vicinity of oracle and parotid gland * Can also result in localized \_\_\_\_
gustatory
sweating
flushing
The CAROTID SINUS NERVE
aka
____ Nerve
Contains GVA fibers from:
• ____ in the carotid sinus
• ____ in the carotid body
These inputs are ultimately relayed to both the ____ and the ____ for appropriate reflex responses controlling:
• ____
• B.P.
• ____
hering's baroreceptors chemoreceptors hypothalamus reticular formation respiration cardiac output
A lesion of
HERING’S NERVE
may provoke fluctuations in ____ and ____……may occur as a result of surgical extirpation of malignant ____ lymph nodes
arterial blood pressure
heart rate
deep cervical
Following the origin of the tympanic and carotid sinus nerves, multiple ____
unite with branches of CN X as well as postganglionic sympathetics
to form the
PHARYNGEAL
PLEXUS
near the ____
pharyngeal branches
middle pharyngeal constrictor
Pharyngeal
branches of CN IX provides ____ innervation of mucosa lining the walls of the
____
Mechanical stimulation of the walls of the oropharynx produces a
____
sensory
oropharynx
gag reflex
Pharyngeal ____ and palatal ____… accompanied by:
- closure of the ____
- thrusting of the ____
- opening of the ____
Testing this reflex is the ONLY RELIABLE WAY to assess the integrity of
____ but… There is significant ____ in terms of presence/absence as well as strength of the
Gag reflex
constriction elevation glottis tongue mouth CN IX variation
The nerve then gives rise to a ____ to the lone 3rd pharyngeal arch muscle (____)
muscular branch (SVE) stylopharyngeus
CN IX
The nerve then curves forward and enters the pharynx along with STYLOPHARYNGEUS between the ____ and ____
superior
middle pharyngeal constrictors
If we strip away the mucosa lining the ____
and the ____,
we can follow CN IX as it approaches the ____ OF THE TONGUE
fauces
tonsilar fossa
posterior 1/3 (root)
The nerve may thus be lesioned during tonsillectomy, eliminating ALL sensation from the ____ of the tongue
ipsilateral posterior 1/3
The ____ BRANCH
supplies the palatine tonsil,
fauces and soft palate (GSA)
Two LINGUAL BRANCHES
Transmit ____ and ____ sensation from the posterior third of the tongue
tonsilar
general (GSA)
special (SVA)
Recall that the posterior 1/3 of the tongue
lacks small ____, (featuring instead the nodules of lymphoid
tissue which collectively form the ____)
Gustatory and general sensory nerve endings in the posterior 1/3 convey information via both ____ and ____ fibers in the lingual branches of CN IX
papillae
lingual tonsil
general
special sensory
CN X Vagus Nerve
Like CN IX, the Vagus leaves the medulla from the ____ by multiple rootlets
They are joined by the fibers of the “cranial root of CN ____” arising from ____ at the jugular foramen
postolivary sulcus
XI
nucleus ambiguus
• Preganglionic parasympathetics (GVE) to ____ and ____ mucosa; ____ and ____ viscera
• Special sensory fibers (SVA - taste)
from ____ and valleculae (NOT SHOWN)
- General sensory fibers (GSA) from ____ and auditory canal, PCF meninges, ____ and pharynx
- SVE fibers to ____ and ____ arch muscles
- GVA fibers from ____ of larynx, pharynx, heart, esophagus, GI tract, trachea, bronchi, lungs; also ____ receptors
pharyngeal
laryngeal
thoracic
abdominal
epiglottis
auricle
larynx
4th
6th
visceroreceptors
SVE fibers arise from the ____
GVE Fibers arise from the
____
The SUPERIOR (JUGULAR) and INFERIOR (NODOSE) GANGLIA are exclusively \_\_\_\_: The JUGULAR is concerned with \_\_\_\_ sensation The NODOSE with \_\_\_\_ sensation
nucleus ambiguus dorsal vagal nucleus sensory somatic visceral
The vagus nerve innervates pharyngeal and laryngeal musculature derived from the ____ and
____ pharyngeal arches
4th
6th
