Information Flow/Connections In The Retina
Neurophys final pg. 150-155, 162-164
- 1.What is the purpose of having several different rod pathways?
- A.
More rods so need more pathways
- B.
Allow greater response over greater range of light levels
- C.
Able to differentiate between different wavelengths better
- 2.In the rod pathways, the rod A2 amacrine cell is involved in connections between:
- A.
Rod ON BP and cone ON BP
- B.
Rod BP and OFF GC
- C.
Rod OFF BP and cone OFF BP
- D.
A and b
- E.
B and c
- 3.Where are BP cells found?
- A.
ONL
- B.
ELM
- C.
INL
- 4.The OPL is divided into 2 sublamina A and B
- A.
True
- B.
False
- 5.Sublamina A of the IPL is more ______ or closer to the ___ cells
- A.
Distal; GC
- B.
Distal; BP
- C.
Proximal; GC
- D.
Proximal; BP
- 6.Sublamina A is associated with the ON pathway
- A.
True
- B.
False
- 7.A biplexiform cell is a bipolar cell that receives info directly from the photoreceptors.
- A.
True
- B.
False
- 8.Biplexiform cells receive mostly rod input and their function is unknown.
- A.
True
- B.
False
- 9.How much of the brain is used to process visual information?
- A.
20%
- B.
50%
- C.
60%
- 10.How many types of horizontal cells are there in primate retina?
- A.
1
- B.
2
- C.
3
- 11.H1 cells ______ info and H2 cells ______ info
- A.
Concentrate; multiply
- B.
Multiply; concentrate
- C.
Multiply; multiply
- 12.Horizontal cells have cell bodies in the _____ and synapses in the _____.
- A.
OPL; INL
- B.
INL; IPL
- C.
INL; OPL
- 13.Decribe how we know that horizontal cells are not involved with carrying color vision information.
- 14.How do Horizontal cells contribute to receptive fields?
- A.
Produce the RF center of GCs
- B.
Produce the RF surround of GCs
- C.
Can produce both the RF center and surround
- 15.Amacrine cells have long axons which allows them to contact many different BPs
- A.
True
- B.
False
- 16.Midget GCs receive as much input from amacrine cells as they do from BPs
- A.
True
- B.
False
- 17.There are 25 different amacrine cells each with a known visual function
- A.
True
- B.
False
- 18.A2 cells mediate ___ vision and contain _____ as a neurotransmitter
- A.
Rod; glycine
- B.
Rod; glutamate
- C.
Cone; glycine
- D.
Cone; glutamate
- 19.Describe how amacrine cells are involved in GC's response to high temporal frequency changes in the environment
- 20.A smaller receptive field results in higher spatial resolution.
- A.
True
- B.
False
- 21.What cell is responsible for the feedback loop in the retina?
- A.
Biplexiform cells
- B.
Ganglion cells
- C.
Interplexiform cells
- 22.Indicate what changes occur in the receptive field during dark adaptation.
- A.
Reduced color vision
- B.
More sensitive to low light levels
- C.
Reduced VA
- D.
RF center gets larger
- 23.What cell is thought to be involved in the changes that occur in the receptive field during dark adaptation.
- A.
Biplexiform cells
- B.
Ganglion cells
- C.
Interplexiform cells
- 24.Describe the ON PATHWAY in terms of cells involved and cellular responses.
- 25.Describe the OFF PATHWAY.
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