Flashcards
central visual pathways
Cards in this deck (25)
- 1what is the pathway of the retinal GC? to the brain?light rays thru the optic nerve > optic tract > hypothalamus > pretectum >superior colliculus
- 2pretectumallows for reflex control in pupil and lens
- 3what kind of response is ppil dilation?an automatic response
- 4superior colliculusallows for the eyes to move along with the head.
- important in the vestibular system - 5vestibular system?the sensory system dealing with the brain and ears;
- controls balance and eye movements - 6pupillary light reflextemporal 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) - 7where does the nasal field crossover in the brain?nasal frield crosses over in the optic chiasm; input is seperated by the visual field
- 8why 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.
- 9where does the PLF happen in the brain?it ultiamtely occurs in the superior colliculus of the brain; it's an auto response.
- 10visual field damage in the optic nerveblocks sight in the RVS - nasal and temporal
- 11VF 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) - 12VF 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) - 13vf dmg in the optic radsLVS: left top temporal sight is blocked
RVS: same thing in the right eye - 14vf dmg in the striate cortexmacular sparing the the LVS and RVS
- 15how does each neuron choose its preference?by tuning to its own specific orientation
- 16pop'n coding???rapid firing ; makes the brain think that is what we identify the colour as.
- 17anopsialarge VF deficit
- 18scotomasmall VF deficit
- 19homoymous hemianopsiacomplete loss of vision in the affected region of the binocular VF
- 20bitemporal hemianopsia. heterodmg in the OC; loss of vision in the temporal field in each eye.
- 21macular sparing??Loss of viision in the VF with the foveal vision still intact.
= common; due to dmg in the cortex along the CVP - 22preferred orientation?coritical neurons tuned to a specific orientation ('likes')
- shows a peak in a tuning curve bc it is most rapid, responsive. - 23the striate cortex functions as?SC functions in allowing for binocular vision of two eyes
- 24where do axons terminate in the optic tract ?in the lateral geniculate nucleus of brain
- 25—
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- Description
- from retina --> lateral geniculate nucleus --> pvc
- Created by
- Alice Nugu · May 2016
- Updated
- Jun 22, 2016
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