CENTRAL VESTIBULAR PROJECTION - MODULE Flashcards Preview

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Flashcards in CENTRAL VESTIBULAR PROJECTION - MODULE Deck (24)
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1
Q

In the transmission of robust vestibular information to the CNS Afferents of vestibular organs carry info to electrical impulses to…

A

to vestibular branch of the vestibulocochlear nerve.

2
Q

Central processes that travel within the vestibular branches of the vestibulocochlear nerve and enter the brainstem where?

A

at the pontomedullary junction

3
Q

Where is the vestibular nuclei complex located

A

at the posterior tegmentum within the brainstem

4
Q

Vestibular nuclei complexes receive afferents from the ____ and relay ____

A

vestibular apparatus vestibular information

5
Q

The nuclei complex is divided into what?

A

lateral vestibular nuclei

Medial vestibular nuclei

6
Q

What type of information does the lateral vestibular process? where is this info coming from?

A

about linear acceleration

from the otolith organs

7
Q

What type of information does the medial vestibular process? where is this info coming from?

A

about rotational acceleration

from semicircular ducts

8
Q

the vestibular nuclei receive information from the cerebellum related to _____ f

A

balance

9
Q

what is the term for the parts of the cerebellum which are reciprocally interconnected with the vestibular nuclei

A

vestibulocerebellum

10
Q

What are the 4 vestibulocerebellum

A

Fastigial nuclei
Flocculus
Nodulus
Oculomotor vermis

11
Q

What does the fastigial nuclei do

A

contributes to the vestibular cervical reflex and vestibular spinal reflex for postural stability

12
Q

What does the flocculus do

A

Generates compensatory eye movements and contributes to the vestibulo-ocular reflex

13
Q

What does the nodulus do

A

Receives vestibular input from the vestibular nuclei complex

14
Q

What does the oculomotor vermis do

A

coordinates vestibular, oculomotor and cortical input

15
Q

What does vestibulocervical reflex do

A

facilitates postural adjustments of the head muscles in response to movement

16
Q

What does the vestibulospinal reflex facilitate

A

postural stability of the body with input to musculature in the legs and trunk

17
Q

What are the steps to the vestibulo-ocular reflex (hard question)

A
  1. semicircular ducts detect rotational acceleration
  2. Afferents of the semicircular ducts project to the medial vestibular nucle
  3. input project to the contralateral abducens nuclei
  4. 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)
18
Q

What are the steps of the vestibuloocervical reflex

A
  1. Semicircular ducts detect rotational acceleration
  2. afferents of the semicircular ducts project to the medial vestibular nuclei
  3. fibers travel in the descending medial longitudinal fasciculus
  4. input to the cervical levels of the spinal cord allow for head and neck muscles to respond accordingly
19
Q

The vestibulospinal reflex works in response to… detected by…

A

rotational and linear acceleration

detected by the semicircular ducts and otolith organs

20
Q

The vestibulospinal reflex facilitates rapid adjustments by muscles of the trunk and lower limb through..

A

both lateral vestibulospinal tract and descending medial longitudinal fasciculus

21
Q

What is the vestibulospinal reflex’s response to rotational acceleration

A
  1. semicicular ducts detect rotational acceleration
  2. afferents of the semicircular ducts project to the medial vestibular nuclei
  3. fibers travel in the descending medial longitudinal fasciculus
  4. input all levels of the spinal cord allow for muscles of the trunk and lower limb to respond accordingly
22
Q

What is the vestibulospinal reflex’s response to linear acceleration

A
  1. Otolith organs detect linear acceleration
  2. Afferents of the otolith organs project to the lateral vestibular nuclei
  3. fibers travel in the lateral vesibulospinal tract
  4. input all levels of the spinal cord allow for muscles of the trunk and lower limb to respond accordingly
23
Q

Projections from the vestibular nuclei to the cortex are believed to contribute to…

A

proprioception and our perception of extra-personal space

24
Q

Where is the vestibular cortical target located

A

Located at the primary and secondary somatosensory areas, which also receive convergent visual and somatosensory information