CN IX, X, XI, XII Flashcards
XII axon type? origin? Peripheral termination?
GSE, hypoglossal nucleus, tongue muscles
What muscle that protrueds the tongue is innervated by XII
Genioglossus m.
A hypoglossal nerve lesion is associated with what 4 things?
LMN lesion
Deviation toward side of lesion
Fasciculations
Atrophy
A Corticobulbar lesion is associated with what 3 things?
- Deviation toward side opposite UMN lesion
- No fasciculations
- Minimal atrophy
XI axon type? origin? Peripheral termination?
SVE, Accessory nucleus in C-spine (caudal medulla to C5). Sternomastoid, traps mm.
3 effects of accessory nerve lesion on trapezius?
1) Scapula/clavicle hang due to weakness
2) Weak shoulder shrug as levator scapulae m. must work alone.
3) Muscle atrophy leads to scalloped appearance of neck contour
How might an Accessory nerve lesion on the trapezius occur?
Damage from lymphadenectomy surgery for treatment of head/neck cancers.
Axon type for CN IX and X?
all of them, sick.
CNS origin/termination for IX SSA/GVA axons? PNS?
CNS Origin: nucleus of solitary tract
PNS:
SSA: Posterior 1/3 taste buds
GVA: Carotid body/sinus
CNS/PNS origin/termination for IX GSA
CNS: spinal trigeminal nucleus
PNS: Mucosa posterior 1/3, pharynx, middle ear, outer ear skin
CNS/PNS origin/termination for IX GVE
CNS: Inferior salivatory nucleus, Otic ganglion
PNS: Parotid gland
CNS/PNS origin/termination for IX SVE
CNS: Nucleus ambiguus
PNS: Pharynx (stylopharyngeus)
Carotid body sends IX afferents in association with what?
Blood O2, CO2 and pH
Carotid sinus sends IX afferents in association with what?
Changes in BP
Pain associated with glossopharyngeal neuralgia begins where? then radiates where?
Posterior tongue/pharynx wall, radiates to ear
How glossopharyngeal neuralgia is treated (2)
- Meds
- Tractotomy of spinal trigeminal tract in caudal medulla
CNS/PNS origin/termination for X GSA
CNS: Spinal trigeminal nucleus/superior ganglion of X
PNS: Skin of outer ear
CNS/PNS origin/termination for X SVA
CNS: Nucleus of solitary tract/inferior ganglion of X
PNS: Taste buds: epiglottis and esophagus.
CNS/PNS origin/termination for X GVA
CNS: Nucleus of solitary tract/inferior ganglion of X
PNS: Thoracid/abdominal viscera. Mucosa of larynx/pharynx. Stretch receptors aortic arch. Chemoreceptors aortic bodies
CNS/PNS origin/termination for X GVE
CNS: DMNX, nucleus ambiguus
PNS: Thoracic/abdominal viscera: smooth muscle/glands
CNS/PNS origin/termination for X SVE
CNS: Nucleus ambiguus
PNS: Larynx/pharynx.
Soft palate innervation from cn
VII
Epiglottis innervation
X
Circumvallate papillae innervation
IX
