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visual pathway-exam3
Neuroanatomy - Visual pathways exam 3
Question | Answer |
---|---|
Retina | 3 neuron chain |
3 neuron chain | photoreceptors, bilpolar cells, ganglion cells (axons form optic nerve) |
Light reflex | fibers project bilaterally from accomodation center in superior colliculus to Edinger-Westphal nucleus to ciliary ganglion |
Argyll Robertson Pupils | usually the result of tertiary syphilis (accompanied by tabes dorsalis) |
Argyll Robertson Pupils | pupils are small & not reactive to light |
Arryll Robertson Pupils | accomodation reflex intact |
blindness in one eye | lesion in optic n. |
loss of peripheral vision | bitemporal hemianopsia |
loss of peripheral vision | lesion in optic chiasm |
loss of nasal visual field | nasal hemianopsia |
loss of nasal visual field | lesion on side of chiasm |
loss of R or L visual field | homonymous hemianopsia |
Loss of R or L visual field | lesoin in optic tract or cortex |
Loss of quadrant (both eyes) | superior quadrant anopsia |
loss of quadrant (both eyes) | lesion in Meyer's loop |