5536989
Description
Flashcards by Alice Nugu, updated more than 1 year ago
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Created by Alice Nugu
almost 8 years ago
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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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