Karius- Special Senses: Vision Flashcards
What are bipolar ON-center cells during in light?
Depolarized in center
Hyperpolarized in off part
Misc - these are metabotropic R, NT release = decreased cation influx
What are bipolar OFF-center cells during light?
Center is hyperpolarized
Outside is depolarized
Misc - AMPA R
ON-center tells us what?
Where something is
OFF-center tells us what?
Where something ends
Edges
First place for AP in eye?
Ganglion cells
Vertical pathway for rods
Important in low light
Many rods converge on ON-center bipolar cell
Vertical pathway rod synapses on
And what is pathway after that?
A 11 amacrine cell
–> ON-center bipolar –> ganglion cell –> optic n –> optic chiasm –> lateral geniculate body
What gets rid of distortion?
Amacrine and horizontal cells
–inhibitory signals
Functions of the lateral geniculate body?
Control eyes as they converge
Identify major elements and motion
What is primary visual cortex responsible for?
V1 - first place - edges and contours
What is V2 important for?
Identify disparities in visual image of 2 eyes
Depth perception
Close your eyes, take a deep breath and see yourself submitting your test tomorrow. See yourself getting an A. Know that you are a smart, fantastic future doctor.
Seriously. We’ve got this.
What are blobs for?
Color detection, begin processing
What is V4 important for?
Color processing
2 pathways for higher visual processing?
Dorsal - enables us to act on what we are seeing
Ventral - name and copy an image
