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21 Cards in this Set
- Front
- Back
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Dorsal Lateral geninculate nucleus (dLGN)
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located in thalamus. Receives visual info from retina, sends to visual cortex
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Pretectum (pretectal nucleus)
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located at midbrain-thalamus boundary. responsible for pupillary light reflex
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Superior Colliculus
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in midbrain, coordinates head and eye movements (reflexive structure)
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Suprachiasmatic nucleus
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in hypothalamus, involved in day and night cycles
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optic disk
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where all RGC axons exit the eye. creates a blind spot
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optic nerve
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myelinated nerve of RGC axons leaving the eye
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Optic Radiation
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portion of the internal capsule containing the axons from LGN that project to the visual cortex
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Pupillary light reflex
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shining light in one eye leads to the constriction of both eyes
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Temporal axons project
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ipsilaterally
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nasal axons project
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contralaterally
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dLGN layers that convey contralateral information
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1,4,6
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dLGN layers that convey ipsilateral information
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2,3,5
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anopsia
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large deficit in visual field
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scotoma
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smaller deficit in visual field
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LGN projects to this layer of the cortex
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layer 4
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What stimuli do LGN neurons respond to
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Bars or lines of a particular orientation
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Simple LGN cells
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respond to stimulus only if matches orientation.
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Complex LGN cells
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bigger receptive fields, not strongly orientation selective, no clear on or off zones, detect movement
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M Ganglion cells
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big, have large receptive fields, fast conduction velocities, respond transiently to visual stimulation. Do not respond well to color b/c center and surround are same type of cone
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P Ganglion cells
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respond to color. center and surround are different types of cones.
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cerebral achromatopsia
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do not see in color- only black and white. lesions in extrastriate cortex regions like V4 or in ventral stream
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