Vision pathways Flashcards
Where is the primary visual cortex?
Occipital lobe
What photoreceptors absorb black and white?
Rods
What photoreceptors absorb colour?
Cones
What is the epithelium of the retina and how is it adapted?
Pigmented epithelium.
Black in colour to absorb any extra light that hasn’t been absorbed - stops double vision
Which photoreceptors converge?
Rods so they are more likely to activated at low light
What type of neurone do the photoreceptors send fibres to?
Bipolar neurone
Where do fibres from bipolar neurones fo?
Synapse at retinal ganglion cell and then onto primary visual cortex
What are horizontal cells?
Interneurones that affect the output from photoreceptors by amplifying and modifying signals
What are amarcrine cells?
Inhibitory interneurones that affect output from bipolar or retinal ganglions cells by inhibiting
Are the membranous discs of the photoreceptors close to pigmented epithelium of bipolar cells?
Pigmented epithelium
What proteins do the membranous discs of rods contain?
Rhodopsin
What proteins do the membranous discs of cones contain?
Photopsin
Where does the optic nerve leave the skull?
Optic fo.
Describe the route of the optic nerve to the occipital lobe
Optic nerve to optic chiasm to optic tract to lateral geniculate nucleus of thalamus or superior colliculus to occipital lobe
Which muscles of the eye does to oculomotor nucleus control?
Superior, infer and medial rectus and inferior oblique
