Biological aspects: Visual system 1

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  • Created by: CanveySam
  • Created on: 13-05-15 09:59
2 main areas to consider?
1) Retina 2) Central visual pathway
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What is the retina?
A sheet of photoreceptors and connecting neurons
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the photoreceptors are situation ... the neurons
BEHIND the neurons
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Photoreceptors: Rods and ...?
rods and CONES
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What do rod system do?
1) Mediate nocturnal vision 2)convergent pathway to ganglion cells 3) sensitive but poor spatial
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what does the cone system do?
1) mediate colour vision 2) direct pathway to ganglion cells 3) low sensitive; high spatial
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Fovea only contains ...?
Cones
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In the rest of the retina, ... are more frequent than ...
rods more frequent than cones
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Describe route of light to ganglion cells
Light, Rhodopsin split, membrane changes, bipolar cells, ganglion cells
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Proper name for the blind spot
Macula cieca
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What do M and P cells stand for?
Magnocellular and Parvocellular
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What is an M cell?
large cell body, rich dendritic ramification
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what is a P cell?
small cell body, limited ramification
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What do M cells pick up?
(large receptive fields) large objects, movement
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what do P cells pick up?
(small receptive fields) small objects, details, colour
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Architecture of LGN is highly ...
organised
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What is the LGN?
Lateral geniculate nuclei
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Layers 2,3,5 receive input from the ... retina
ipsilateral retina
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Layers 1,4,6 recevie input from the ... retina
contralateral retina
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Primary visual are, BA ??
BA17
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M or P pathway for movement?
M pathway
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M or P pathway for colour and details?
P pathway
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Receptive fields in the ... are more complex than those found in the ... and ...
cortex more complex than those in the retina and lateral geniculate nucleus
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Input from the LGN reaches WHICH layer of visual cortex?
IV
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Visual cortex is organised in ...
organised in COLUMNS
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LGN to which layer?
IV, V1
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Colour, which area?
V4
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Motion, which area?
V5
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Brain lesion in V5 have been associated in ?
Akinetopsia
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Brain lesion in V4 have been associated in?
Achromatopsia
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Dorsal pathway for ...
where? (object location)
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Ventral pathway for ...
what? (object recognition)
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bilateral lesions of parieto-occipital
Balint's syndrome
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lesions in the occipital-temporal area?
Agnosia
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Other cards in this set

Card 2

Front

What is the retina?

Back

A sheet of photoreceptors and connecting neurons

Card 3

Front

the photoreceptors are situation ... the neurons

Back

Preview of the front of card 3

Card 4

Front

Photoreceptors: Rods and ...?

Back

Preview of the front of card 4

Card 5

Front

What do rod system do?

Back

Preview of the front of card 5
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