Lec 12 - 3 - Visual Flashcards
these make up the outermost retina
rods/cones
are there more cones or rods
rods
cones for short wavelength
blue
cones for medium wavelength
green
cones for long wavelength
red
near central area of the retina that has all cones and best vision
fovea
disc in outer segment of rods has blank
rhodopsin
rods have cation channels that are opened by high levels of blank which are present in the dark
cGMP,
more light leads to blank open channels so there are blank signals when light increases in rods
fewer, less
cones work similarly to rods but they have blank instead of rhodopsin
cone opsins
disease leading to loss of peripheral vision and can lead to blindness
retinitis pigmentosa
ganglion cells can have blank or blank responses
sustained, transient
ganglion cell centers in the fovea are blank in degrees compared to ganglion cells in the periphery
smaller
compared to the fovea, the periphery ganglion cells have more blank so it’s not as precise but it lets you see better in the dark
convergence
90 percent of optic axons go to this nucleus
lateral geniculate
there are blank of the lateral geniculate nucleus so cells with color selective responses wiill project to a different blank that is not color selective
layerrrrrrr
brodmanns area of visual cortex
17 in occipital
largest are in visual cortex is devoted to this part of the eye
fovea
axons from lateral geniculate terminate in this layer of cortex
4
most cells in layer four have blank receptive fields with center surround organization
circular
cells in other layers respond best to blank
straight bars or edges
all cortical cells are blank selective but only some are blank selective
orientation, directionally
basic unit of striate cortex
orientation column
where stream of vision is located here
parietal
what stream of vision is located here
temporal
