central visual pathways

Alice Nugu
Flashcards by Alice Nugu, updated more than 1 year ago
Alice Nugu
Created by Alice Nugu over 4 years ago
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from retina --> lateral geniculate nucleus --> pvc
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Question Answer
what is the pathway of the retinal GC? to the brain? light rays thru the optic nerve > optic tract > hypothalamus > pretectum >superior colliculus
pretectum allows for reflex control in pupil and lens
what kind of response is ppil dilation? an automatic response
superior colliculus allows for the eyes to move along with the head. - important in the vestibular system
vestibular system? the sensory system dealing with the brain and ears; - controls balance and eye movements
pupillary light reflex temporal field of vision stays on the same side of the brainn. nasal field of sight is sent to the brain in opposite directions (it is flipped)
where does the nasal field crossover in the brain? nasal frield crosses over in the optic chiasm; input is seperated by the visual field
why do we have the pupillary light reflex? for visual data to stay on the same side. so we do not the world in opposite ways.
where does the PLF happen in the brain? it ultiamtely occurs in the superior colliculus of the brain; it's an auto response.
visual field damage in the optic nerve blocks sight in the RVS - nasal and temporal
VF damage in the optic chiasm (OC) In LVS: blocks sght on the left temporal side of brain In RVS: blocks sight on the right temporal side of brain (OC same sides are blocked)
VF damage in optic tract (OT) In LVS: blocks vision in the left temporal side In RVS: blocks vision on the right NASAL side of brain (OTN)
vf dmg in the optic rads LVS: left top temporal sight is blocked RVS: same thing in the right eye
vf dmg in the striate cortex macular sparing the the LVS and RVS
how does each neuron choose its preference? by tuning to its own specific orientation
pop'n coding??? rapid firing ; makes the brain think that is what we identify the colour as.
anopsia large VF deficit
scotoma small VF deficit
homoymous hemianopsia complete loss of vision in the affected region of the binocular VF
bitemporal hemianopsia. hetero dmg in the OC; loss of vision in the temporal field in each eye.
macular sparing?? Loss of viision in the VF with the foveal vision still intact. = common; due to dmg in the cortex along the CVP
preferred orientation? coritical neurons tuned to a specific orientation ('likes') - shows a peak in a tuning curve bc it is most rapid, responsive.
the striate cortex functions as? SC functions in allowing for binocular vision of two eyes
where do axons terminate in the optic tract ? in the lateral geniculate nucleus of brain
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