The eye Ch 52 Flashcards
Central Neurophysiology of Vision
Visual pathway
Nasal halves:
Optic nerves –>cross at optic chiasm–>optic tract
Temporal retinas: Optic nerve–>optic chiasm (don’t cross)–>optic tract
Fibers of optic tract synapse in
dorsal lateral geniculate nucleus (thalmus)
Visual fibers pass to (4)
- suprachiasmatic nucleus of hypothalmus
- Pretectal nuclei in midbrain
- Superior colliculus
- Ventral lateral geniculate nucleus of thalmus
Suprachiasmatic nuclus of hypothalmus responsible for
circadian rhythms
Pretectal nuclei in midbrain responsible for
reflex movement of eye
Superior colliculus responsible for
eye movement
Ventral lateral geniculate nucleus of thalamus responsible for
body behavior
Layers of dorsal lateral geniculate nucleus
half come from one eye, half from the other
dorsal lateral geniculate nucleus role
gate transmission of signals, controls how much of signal passes to cortex
Magnocellular layers input comes from
type M ganglion cells
(rapid conduction, black and white)
Lizard brain
Parvocellular layers get input from
type P ganglion cells
(transmit color, convey accuracy, moderate conduction velocity)
Visual cortex location
calcarine fissure area, terminus of visual signals
Primary visual cortex has ___ layers
6 layers
M retinal ganglion cells terminate
in Ivcalpha
P ganglion cells terminate in
layer Iva and Ivcbeta