Flashcards in Visual System Deck (49)
the apparatus of ciliary body and iris
retinal pigment epithelium fxn? layer?
instrumental in the health of the retina. without it the retina dies (i.e. retinal detachment)
where gangion cell axons collect to form the optic nerve; blind spot
- contains the FOVEA,
- most ACUTE vision.
- it is YELLOW
where does the optic nerve come from
developmentally the optic cup comes from the diencephalon
review: where does the lens come from?
whats layer 2
Rods and cones
rods and cones project to?
horizontal and bipolar cell
what do horizontal cells connect to
- other rods/cones.
what do bipolar cells connect to
rods/ cones ==> amacrine cell and gangion cell
amacrine cells connect to
bipolar cells and ganglion cells
where are the nuclei of rods and cones
in the outer nuclear layer (layer 4)
where do the synapses between bipolar cell and rods/cones
outer plexiform layer (layer 5)
where are bipolar cell bodies
inner nuclear layer (layer 6)
where bipolar cells synapse with ganglion cell
inner plexiform layer (layer 7)
where the banblion cell body is
ganglion cell layer (layer 8)
optic disk is ALWAYS ___ to fovea
are there retinal layers in fovea?
not really. there are only cones here, and the cones have a 1:1 relationship with bipolar cells.... the info basically goes directly to the photoreceptor layer of the eye. theres a lot LESS convergence
scotopic vision is
low light vision
photopic vision is
best acuity becuase the cones are taking over, and rod saturation is present
what portion of the retinal information goes over to the right lateral geniculate nucleus
right lateral geniculate nucleus gets info from the temporal half of the R retina AND the nasal portion of the L retina
optic tract gets blood from?
lesion is called?
anterior choroidal artery. lesion is homonymous defect
4 arteries of optic radiations
PCA deep branches, anterior choroidal, MCA inferior division, PCA
first two layers of lateral geniculate nucleus
magnocellular layrs, receive input from retinal ganglion from M cells; LARGE receptive fields that are FAST conducting, info relating to MOTION
last four layers of lateral geniculate layers
parvocellular layers get input from retinal ganglion p cells and have SMALL receptive fields and COLOR info (cones)
what layers of lateral geniculate layers are for CONTRALATERAL eye
each point in visual space is mapped....
6 times in the LGN
line of gennari
axons that form a line in layer 4 of the cortex... primarily in layer 4C
THIS IS ONLY IN BRODMAN AREA 17
layer 4C alpha gets info from
M cells (magnocellular)