Central Processing

Question 1

what is binocularity

Answer 1

some ganglion cells project to the same side, some to opposite sides

Question 2

what is the LGN

Answer 2

thalamic nucleus through which visual information is routed to the visual cortex

Question 3

what is anatomy of the LGN

Answer 3

ladder structure with 6 layers
largest cells (m cells) in layers 1 and 2

Question 4

describe projection in LGN

Answer 4

visual info from the two visual fields is kept separate

Question 5

what is ipsilateral and contralateral projection

Answer 5

in right LGN, right eye axons synapse on LGN layers 2,3,5

left eye axons synapse on layers 1,4,6

Question 6

what is the retinotopic map of visual cortex

Answer 6

retina
LGN
striate cortex (layer IVC)

Question 7

where do signals coming from LGN project to

Answer 7

visual cortex V1(area 17/striate cortex)

Question 8

what are two cell types of LGN

Answer 8

stelate cells (very small, not proper axons, in layer C4)
pyramidial cells (structure that radiate through cortex, only cells with axons that exit cortex)

Question 9

what are three parallel processing channels

Answer 9

m channel
p-ib channel
blob channel

Question 10

what is m channel

Answer 10

magnocellular
analyses object motion
simple cells that are orientation sensitive

Question 11

what are P-Ib channel

Answer 11

parvocellular interblob
layer 3 analyses object shape
receive binocular inputs

Question 12

what are blob cells

Answer 12

parvo and koniocellular
object colour
wavelength sensitive