Vestibular system: Eyes Flashcards
What are characteristics of medial local circuit neurons?
They are for long distance
Project to many spinal cord segements
Bilateral
Help adjusting posture
Have a reflexive maintenance of balance
What are characteristics of the medial vestibulo spinal tract?
Motor neurons are in the cervical spinal cord
Help for reflexes when falling (head/neck movements backward, extension of arms)
What are characteristics of the lateral vestibulo spinal tract
Via lumbal sacral spinal cord
Ipsi lateral pathway
Extensor tone in the legs
Controls antigravity muscle
From which structure of the vestibular system does the cerebellum intergrates information from?
From semicircular & otoliths
What kind of vestibular activity does the cerebellum modulate?
Posture and equilibrium
Distinguishment of voluntary and passive movements of the head
In which cortex does the vestibular system send its information to?
Parietal cortex (via thalamus)
What is the optokinetic system sensitive to?
Slow movements of the head
Slow drift of images across the retina
Which brain structures control saccades?
Cerebral cortex and superior colliculus
What happens when there is a lesion in the superior colliculus in this context?
Changes latency, accuracy, velocity, frequency of saccades
What happens when there is a lesion in the frontal eye field in this case?
No saccades to contralateral
