09 Retinal Organization Flashcards
Cell coverage is uniform throughout the retina. T/F
True
As the cell is farther away from the fovea, its dendritic field gets ________.A. No changeB. SmallerC. Larger
C
Parasol cells have smaller dendritic fields than midget cells. T/F
False. Midget cells have smaller dendritic fields than parasol cells.
Parasol cells code for __________ and midget cells code for __________.A. Color/LuminanceB. Color/ColorC. Luminance/ColorD. Luminance/Luminance
C
Coverage factor is dependent on ________ and ________.
Size of dendritic field and spatial density
The coverage differential for amacrine cells is _________ and the coverage of ganglion cells is ________ and the coverage for S-cones is _________.
700, 1, 0.1
Midget cells do not ever overlap. T/F
True
Ganglion cells turn on with response to light when their connections form in the _________.
Inner layer
Transient response refers to light duration. Sustained response refers to if the light was on or off. T/F
False. Sustained response refers to light duration. Transient response refers to if the light was on or off.
Nasal quadrant has a ______ cell density and ______ resolution than temporal quadrant.A. Higher/LowerB. Lower/LowerC. Lower/HigherD. Higher/Higher
D
What 2 factors produce differential patterns within the retina?
Timing of grow and birth of cells
Why are rods missing from the foveola?A. Rods are born later than conesB. During metaphase chromosomes did not segregate properlyC. Rods and cones are born at the same time
A
What color is not distinguishable in the foveola?A. RedB. BlueC. YellowD. Green
B
What types of cones are not found in the foveola?A. L-cones and M-conesB. S-cones onlyC. L-cones onlyD. L-cones and S-cones
B
The entire fovea is higher vascularized. T/F
False. There is a avascular zone in the fovea.
Parasol cells make up ___% of ganglion cells. Midget cells make up ___% of ganglion cells.A. 50, 50B. 90, 10C. 10, 80D. 10, 90
C
Each ganglion cell has its own receptive field. T/F
True
Ganglion cells are never completely turned off. T/F
True
When the edge detector is completely dark, there is a ________ firing rate.A. NoB. SmallC. IntermediateD. Large
C
Midget cell is for ________ response.Parasol cell is for ________ response.
Sustained, Transient
Which cells are good at detecting motion?A. MidgetB. ParasolC. Parasol and Midget
B
Parasol cells has poor temporal frequency of about 12 Hz. T/F
False. Midget cells has poor temporal frequency of about 12 Hz
Under ______ light conditions, the parasol cells respond better to changes in contrast. A. No lightB. BrightC. BlueD. Dim
D
To detect a newborn’s visual acuity, you can record the brain wave activity. A newborn’s visual acuity is best when contrast sensitivity is _______.A. 0B. 100C. 50
A
In a ganglion cell receptive field, the red center is _____ and the green surround is ______.A. Off, OffB. On, OffC. Off, OnD. On, On
B
Diffuse bipolar cell are getting input from ______.A. L-conesB. M-conesC. L-cones and M-cones
C
Which of the following is true regarding S cones?A. get input from S, M, and L-conesB. the input to the center is just from the blue coneC. are small bistratified cellsD. all of the above
D
Signals within the melanopsin ganglion cell use a G-protein coupled receptor. T/F
True
