visual system Flashcards
rods contain the pigment ____
rhodopsin
acuity
resolution
our photo receptors (rods) can detect ____ photons
single
color vision
cones
moonlight receptors
rods
wavelength spectrum of visible light
400 - 700 nm
photoreceptors transduce _______ into neural signals
light energy
the optic nerve is made up of ________ cell axons bundled together
retinal ganglion
photoreceptors are _____ in the dark
depolarized
photoreceptors are _____ in the light
hyper polarized
_____ release from the presynaptic terminal decreases in the presence of light
glutamate
speed of photon transmission
very slow since one can be detected and activate the cascade of channels
papilledema
swollen appearance of the optic disc
rods are located in the
peripheral retina
rods mediate ___ acuity vision
low
cones mediate ___ acuity vision
high
daylight receptors
cones
_____ are involved in your central vision
cones
activity in the green and red cones together of the particular magnitudes gives the sensation of
orange/yellow
fovea of the eye
has absence of blood vessels but dense in cones for optimal function during daylight
foveal photoreceptors have small receptive field size and ____ visual acuity
high
region where the optic nerve exits the retina
optic disc
papilledema is a sign of
increased intracranial pressure
is visual acuity affected in papilledema?
no
the left visual field maps to the ____ hemisphere
right
the right visual field maps to the ___ hemisphere
left
thalamic synapse in the visual pathway
lateral geniculate nucleus
