L4 Visual System Flashcards
Visual system stimuli
food, predator, mate
What defines sensory neuron morphology
its function
Positive feedback in relation to neurons
pre-synaptic neuron activates post-synaptic neuron
What are the types of feedback in the visual system
positive feedforward, negative feedback and negative feedforward
Main retina function
image acquisation
Right hemifield activates
left brain
LGN function
preprocesses visual information
Where does information travel to from the LGN
primary visual cortex
Visual pathways in the cortex
ventral stream and dorsal stream
Ventral stream function
processes object identity
Dorsal stream function
processes object location, speed and direction of movement
Pupil function
regulate amount of light falling on the retina
Lens function
focus image on fovea
Fovea property
part of retina with highest visual acuity
Where are photoreceptors densely packed
Fovea
Rod function
high light sensitivity
Muller cell function
light guides, transmit light to tissue
Retina layers
3 layers of neurons, 2 layers of synapses
Inhibitory retina cells
horizontal and amacrine cells
Synaptic layer OPL
synapses between photoreceptors, bipolar and horizontal
Direct retina pathway
Photoreceptors to bipolar cell to ganglion cell
Synaptic layer IPL
synapses between amacrine, bipolar and ganglion cells
Synaptic layer importance
process of important
Retina synaptic layers
inner and outer plexiform layers
