CENTRAL VESTIBULAR PROJECTION - MODULE Flashcards
In the transmission of robust vestibular information to the CNS Afferents of vestibular organs carry info to electrical impulses to…
to vestibular branch of the vestibulocochlear nerve.
Central processes that travel within the vestibular branches of the vestibulocochlear nerve and enter the brainstem where?
at the pontomedullary junction
Where is the vestibular nuclei complex located
at the posterior tegmentum within the brainstem
Vestibular nuclei complexes receive afferents from the ____ and relay ____
vestibular apparatus vestibular information
The nuclei complex is divided into what?
lateral vestibular nuclei
Medial vestibular nuclei
What type of information does the lateral vestibular process? where is this info coming from?
about linear acceleration
from the otolith organs
What type of information does the medial vestibular process? where is this info coming from?
about rotational acceleration
from semicircular ducts
the vestibular nuclei receive information from the cerebellum related to _____ f
balance
what is the term for the parts of the cerebellum which are reciprocally interconnected with the vestibular nuclei
vestibulocerebellum
What are the 4 vestibulocerebellum
Fastigial nuclei
Flocculus
Nodulus
Oculomotor vermis
What does the fastigial nuclei do
contributes to the vestibular cervical reflex and vestibular spinal reflex for postural stability
What does the flocculus do
Generates compensatory eye movements and contributes to the vestibulo-ocular reflex
What does the nodulus do
Receives vestibular input from the vestibular nuclei complex
What does the oculomotor vermis do
coordinates vestibular, oculomotor and cortical input
What does vestibulocervical reflex do
facilitates postural adjustments of the head muscles in response to movement
What does the vestibulospinal reflex facilitate
postural stability of the body with input to musculature in the legs and trunk
What are the steps to the vestibulo-ocular reflex (hard question)
- semicircular ducts detect rotational acceleration
- Afferents of the semicircular ducts project to the medial vestibular nucle
- input project to the contralateral abducens nuclei
- abducens nuclei excite extraocular motorneurons that innervate ipsilateral muscles via CN VI
4b. Internuclear neurons send projection through the ascending medial longitudinal fasciculus and oculomotor nucleus to extraocular motoneurons innervating contralateral muscles via (CN III)
What are the steps of the vestibuloocervical reflex
- Semicircular ducts detect rotational acceleration
- afferents of the semicircular ducts project to the medial vestibular nuclei
- fibers travel in the descending medial longitudinal fasciculus
- input to the cervical levels of the spinal cord allow for head and neck muscles to respond accordingly
The vestibulospinal reflex works in response to… detected by…
rotational and linear acceleration
detected by the semicircular ducts and otolith organs
The vestibulospinal reflex facilitates rapid adjustments by muscles of the trunk and lower limb through..
both lateral vestibulospinal tract and descending medial longitudinal fasciculus
What is the vestibulospinal reflex’s response to rotational acceleration
- semicicular ducts detect rotational acceleration
- afferents of the semicircular ducts project to the medial vestibular nuclei
- fibers travel in the descending medial longitudinal fasciculus
- input all levels of the spinal cord allow for muscles of the trunk and lower limb to respond accordingly
What is the vestibulospinal reflex’s response to linear acceleration
- Otolith organs detect linear acceleration
- Afferents of the otolith organs project to the lateral vestibular nuclei
- fibers travel in the lateral vesibulospinal tract
- input all levels of the spinal cord allow for muscles of the trunk and lower limb to respond accordingly
Projections from the vestibular nuclei to the cortex are believed to contribute to…
proprioception and our perception of extra-personal space
Where is the vestibular cortical target located
Located at the primary and secondary somatosensory areas, which also receive convergent visual and somatosensory information
