Physiology 2 Flashcards
descirbe the verticla visual pathway
ganglion cells
bipolar cells
photorecptors
in addition to the vertical visual pathway what other connectiosn are there?
lateral connections
what do horizontal cells recieve input from?
recieve input from photoreceptors
what do horizontal cells project to?
other photoreceptors and bipolar cells
what do amacrine cells recieve input from?
bipolar cells
what do amacrine cells project to?
other amicrine cells
bipolar cells
ganglion
photoreceptors are involed in what transduction, what is this?
conversion of electromagnetic to neural signals
light exposure results in hyperpolarization/depolarization?
hyperpolarizarion
vertebrae photoreceptors have a depolarised rmp (Vm) much more positive than other neurones, why is this?
dark current
what is the dark current?
a cGMP gated Na+ channel
when is the cGMP channel open and when is it closed?
open in the dark
closed in the light
what signal enables the brain to percieve objects in the visual field?
change in Na+ with light
visual pigmetn molecules are called what for rods?
rhodopsin
what effect does phototransduction have on teh cGMP channels?
closes the cGMP channels
rods see in dim/normal light?
rods see in dim light
cones see in normal light
