Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
48 Cards in this Set
- Front
- Back
|
What is and Where is cranial nerve IV located and is it motor, sensory, or autonomic?
|
Trochlear. Right above med long fasciculus and fibers wrap around periaqueductal gray matter- decussates!
Motor only |
|
|
What eye muscle does it innervate?
|
Superior oblique muscle
|
|
|
Describe superior oblique muscle and its contraction
|
Runs on medial side of eye and has a pulley which makes it turn caudally,
Contraction causes downward rotation |
|
|
Facts about Trochlear nerve
|
only cranial nerve to exit dorsally
longest intracranial course Fewest axons of any cranial nerve only motor nerve to decussate |
|
|
What are the afferent nuclei of cranial nerve V?
|
Trigeminal.
Spinal-pain and temp from face Pontine- touch from face Mesencephalic -jaw proprioception Motor-motor cortex |
|
|
What are the 3 sensory branches and where do they go?
|
1. Opthalamic- eye and nasal cavity, can influence olfaction
2. Maxillary-teeth of upper jaw 3. Mandibular- lower jaw |
|
|
Where do the 3 sensory branches all run through?
|
semilunar ganglia
|
|
|
What are the Trigeminal reflexes?
|
Motor (jaw reflex-chewing)
Facial (corneal blink) Nucleus ambiguus (sneeze reflex) Dorsal motor nucleus (salivation) Inferior salivatory nucleus (salivation) Hypoglossal nucleus (tongue movement) Superior salvatory nucleus (tearing) |
|
|
What is cranial nerve VI and where is it located?
|
Abducens, pons
lat to mlf and below facial |
|
|
What does VI innervate?
|
lat rectus of eye
|
|
|
What is the lateral gaze center?
|
coordinates action of abducens and occulomotor to coordinate lat and med rectus
this is located in the pons |
|
|
What is VII and where is it located?
|
Facial
|
|
|
Where does the motor part of facial go to?
|
all facial muscles
|
|
|
Where does the visceral motor component of facial go to?
|
salvatory glands
|
|
|
where does special sensory of facial go?
|
taste
|
|
|
Where does general sensory of facial nerve go?
|
part of ear
|
|
|
What is the nervous intermedius?
|
All facial components except motor
|
|
|
What course does the facial nerve take?
|
come up and loop around abducens to make the floor of the 4th ventricle which is called the facial colliculus
|
|
|
Name the 4 nuclei of the facial nerve
|
1. Superior salvatory-forms visceral motor-runs to tears and nose and goes to ptergopalatine ganglia
b. Can also go to submandibular ganglia and sub salvatory glands 2. facial nucleus- somatic motor |
|
|
What is the sensory input of the facial nerve?
|
1. anterior 2/3 of tongue and part of ear go to the geniculate ganglia
-goes to spinal trigeminal nucleus (sharing!) and solitary nucleus |
|
|
What are the facial motor afferents?
|
1. corticobulbar- deciding to smile
2. basal ganglia- emotion |
|
|
What are the facial reflexes?
|
1. superor olive (sound)
2. trigeminal (blinking) 3. superior colliculus (eye closure) |
|
|
What is cranial nerve VIII?
|
Vestibulocochlear
|
|
|
What are the two components of VIII?
|
cochlear part on outside of peduncle (dorsal and ventral nuclei)
vestibular on inside (4 nuclei) |
|
|
What happens when the nerve goes to the cochlear?
|
Cochlear splits between dorsal and ventral nuclei which relays up to superior olivary nucleus and always decussates to form trapezoid body to determine which side sound is on
|
|
|
What is the rest of the course for the VIII?
|
Inferior colliculus to med geniculate body to auditory cortex
all are tonotopically mapped-auditory beltway |
|
|
What is the auditory cortex?
|
superior temporal gyrus-covers up insula-operculum
|
|
|
How do the afferents and efferents work in the cochlear portion VIII?
|
Beltway acts as both to physiologically protect ear
|
|
|
Where does the vestibular component go?
|
Starts in vestibular ganglia to vestibular nuclei to cerebellum or vest ganglia goes directly to cerebellum
|
|
|
What are the ascending afferents to the VIII?
|
1. Up to cerebellum
2. to SC as vestibulospinal 3. To III, IV, VI, for eye movements 4. to VPM of thalamus to motor cortex |
|
|
What is cranial nerve IX?
|
glossopharnygeal
|
|
|
What are the IX components?
|
1. Motor-to face
2. Visceral- to pharynx and larynx 3. Visceral sensory- to carotid sinus 4. Gen sensory-skin, ear, back of throat 5. special sensory- taste from back of tongue |
|
|
What are the three ganglia of IX?
|
1. Otic-carotid
2 and 3. superior and inferior ganglia-top of throat |
|
|
What are the taste buds?
|
sour, salty, sweet, bitter
|
|
|
What nucleus do all 3 ganglia go to?
|
Solitary nucleus
|
|
|
What is cranial nerve IX?
|
glossopharnygeal
|
|
|
What are the IX components?
|
1. Motor-to face
2. Visceral- to pharynx and larynx 3. Visceral sensory- to carotid sinus 4. Gen sensory-skin, ear, back of throat 5. special sensory- taste from back of tongue |
|
|
What are the three ganglia of IX?
|
1. Otic-carotid
2 and 3. superior and inferior ganglia-top of throat |
|
|
What are the taste buds?
|
sour, salty, sweet, bitter
|
|
|
What nucleus do all 3 ganglia go to?
|
gustatory part of Solitary nucleus
|
|
|
What is the course of the IX?
|
from ganglia to solitary nucleus
|
|
|
Describe the pathways of the IX? power point slide
|
The functions are not shared but the nuclei are shared
|
|
|
Cranial nerve X, what are the 4 nuclei?
|
1. ventral motor- nucleus ambiguus
2. dorsal motor- dorsal nucleus 1 and 2 are automonic 3. solitary nucleus 4. spinal trigeminal |
|
|
What does vagus do?
|
thorax and visceral autonomic components
|
|
|
XI what does it do?
|
Motor only, nucleus is ripped apart
|
|
|
What are the 2 components of XI?
|
nucleus ambiguus and spinal cord
|
|
|
What is the pathway of the spinal component?
|
Into foramen magnum and comes out of jugular foramen to split into internal and external ramus to go to trapezius and sternocleidomastoid
|
|
|
What does XII do?
|
hypoglossal
motor only runs in inferior olivary nucleus goes to muscles of tongue |
