Flashcards
visual pathways
Cards in this deck (33)
- 1what is teh 3 neutron chain of the visual pathway?2 neurons in the retina
3rd projects from LGN to primary visual cortex - 2which visual field does teh left LGN receive information from?right visual field
- 3what is teh optic radiation?axons from neurons in th eLGN to the primary visual cortex
- 4where does information from the contraletral eye go to in the LGN?layers 1,4 and 6
- 5where des information from the ipsilateral eye go to in the LGN?2, 3 and 5
- 6which pathway carries information about where objects exist in relation to us?magnocellular
- 7what pathway carries information about shape, size colour, clarity and contrast of objects?parvocellular
- 8what is teh line of gennari?myelinated fibres running from the LGN to synapse in layer 4 of the striate cortex
- 9which visual field travel through the Meyer loopupper visual fields which project to lower retinal fields
- 10what do the large magnocellular cells (or parasol ganglion cells) encode for?a colourless signal, best suited for detecting contrast, motion and shape
- 11what stream do the parvocellular pathways project too?teh ventral stream
- 12what information is projected through teh dorsal stream?- where and how
- spatial vision
- visually guided actions - 13where does teh ventral stream project too?teh temporal lobe
- 14where does the dorsal stream project to?the parietal lobe
- 15what visual defect would arise from a lesion to the one meyer loopcontralateral superior quadrantanopia
- 16what would a lesion to the entire visual cortex on one side result in?contralateral homonymous hemianopia
- 17what does a lesion to the optic chasm result in?bitemporal hemianopia
- 18from which angle will a pituitary lesion cause compression to the optic chiasm?from below
- 19which fibres are most vulnerable from a pituitary tumour?decussating fibres (temporal visual fields) from upper visual fields
- 20what fibres is a craniopharyngioma most likely to affect?upper fibres so lower visual fields
- 21what is a common brain injury in premature babies?preventricular leukomalacia
- 22what area in the brain does the preventricular leukomalacia affect?teh ventral and dorsal stream
- 23what is the word for the inability to read wordsalexia
- 24what is the word for the loss of route findingtopographic agnosia
- 25what is the words for loss of facial recognitionprosopagnosia
- 26on a snellen chart, when are you classified as blind?3/60 (you can see at 3m what a normal eye can see at 60m)
- 27which disease is a contagious bacterial infection which affects the conjunctival covering of the eye, the cornea and teh eyelids?trachoma
- 28which bacteria causes trauchoma?chlamydia trachomatis
- 29what indicates the trachomatous follicular stage?presence of 5 or more follicles in the upper tarsal conjunctiva
- 30what can trauchoma lead to?corneal scaring
- 31what virus can cause disciform keratitisherpes simplex type 1
- 32what is teh commonest cause of visual loss in the working population in the developed world?diabetic retinopathy
- 33which eye pathology is common in tropical areas?microbial keratitis
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- Neuro Flashcards on visual pathways, created by hazel wilkie on 01/07/2019.
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- hazel wilkie
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