6. Normal Development of the Central Visual System Flashcards Preview

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Flashcards in 6. Normal Development of the Central Visual System Deck (15)
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1

What happens during E68

right and left eye synapses are intermixed

2

What happens during E77

the inputs from the 2 eyes start to separate into clusters

3

What happens during E91

the LGN has found its position sitting to the side and beneath the thalamus, where there are distinct dark and light clusters

4

What do the dark areas of the LGN correspond to?

input from the contralateral eye

5

What do the light areas of the LGN correspond to

input from the ipsilateral eye

6

What happens during E130

speckles start to move to form layers

7

At what time does enucleation of one eye lead to clusters of empty space where input from the enucleated eye should be

Enucleatinon at E91

8

during gestation, what is the source of synchronous firing?

waves of calcium moving through the retina
-more intense the calcium=greater the number of action potentials coming from that specific area in the retina

9

synchronous firing of ganglion cells helps organize precise retinotopic projections to the LGN that separate into what?
what does the cortex separate into?

LGN=layers
cortex=ocular dominance columns

10

what is the basis for the formation of layers in the LGN and coarse VF layout?

synchronous firing in response to calcium in the retina

11

where do inhibitory interneurons originate from? how do they travel? via what?

originate in the striatum and travel horizontally through the cortex via amoeboid actions
-form connections between cortical columns rather than w/in them

12

what are the 3 types of neurons in the infant rat hippocampus?

place cells: fire when rat is in specific place w/in their environment
direction cells: fire when rat is facing a specific direction
grid cells: fire at the vertices of a regular repeating grid that covers the environment, environment expands the grid will expand and become less precise

13

which cells in the hippocampus of a rat take the longest to develop?

grid cells take about 2 days
place and direction take seconds

14

what cells beocme finely tuned into columns in the auditory cortex?

pitch and location cells

15

what develop in wenicke's area

phoneme detectors for specific sounds develop